Placement Series
24 free notebook-style PDFs for placement prep, 737 pages in total, by Gaurav Sharma. One concept per page, interview questions marked in pink, traps in orange, and a Hinglish explanation wherever the English gets heavy. No sign-up: download, print, revise.
Handwritten notes · 20
Handwritten notes · Part 1
26 pages of handwritten-style JavaScript notes for placements and interviews: hoisting, closures, this, prototypes, promises, the event loop, polyfills and output-based questions, explained in English with Hinglish.
Handwritten notes · Part 2
26 pages of handwritten-style C++ notes for placements and interviews: pointers, references, memory, OOP, virtual functions and vtables, templates, STL and smart pointers, explained in English with Hinglish.
Handwritten notes · Part 3
26 pages of handwritten-style React notes for placements and frontend interviews: JSX, state, useEffect, useRef, memoization, Context, useReducer, custom hooks, virtual DOM, React Router, Redux Toolkit, React 18 and 19, and SSR, explained in English with Hinglish.
Handwritten notes · Part 4
26 pages of handwritten-style Node.js notes for placements and backend interviews: the event loop, libuv thread pool, modules, streams, Express middleware, REST APIs, JWT auth, security, MongoDB, scaling and Socket.io, explained in English with Hinglish.
Handwritten notes · Part 5
26 pages of handwritten-style Python notes for placements and interviews: mutability, lists and dicts, comprehensions, *args and **kwargs, decorators, generators, OOP, dunder methods, the GIL and Python for DSA, explained in English with Hinglish.
Handwritten notes · Part 6
26 pages of handwritten-style SQL and DBMS notes for placements and interviews: joins, NULL traps, order of execution, GROUP BY, subqueries, CTEs, window functions, Nth highest salary, normalization, indexes, ACID and isolation levels, explained in English with Hinglish.
Handwritten notes · Part 7
26 pages of handwritten-style OS notes for placements and interviews: processes, threads, CPU scheduling with Gantt charts, mutex vs semaphore, deadlock and Banker's algorithm, paging, virtual memory, page replacement and disk scheduling, with solved numericals, in English with Hinglish.
Handwritten notes · Part 8
26 pages of handwritten-style Computer Networks notes for placements and interviews: OSI and TCP/IP models, subnetting, ARP, DHCP, NAT, routing, TCP vs UDP, the 3-way handshake, DNS, HTTP, HTTPS and TLS, and what happens when you type a URL, with solved numericals, in English with Hinglish.
Handwritten notes · Part 9
26 pages of handwritten-style OOPs notes for placements and interviews: the 4 pillars, abstract class vs interface, overloading vs overriding, dynamic dispatch, composition vs aggregation, SOLID, design patterns, equals and hashCode, with Java examples and Hinglish explanations.
Handwritten notes · Part 10
26 pages of handwritten-style core Java notes for placements and interviews: JVM memory, the Integer cache, Strings, pass by value, Collections, HashMap internals, generics, multithreading, Java 8 streams and garbage collection, explained in English with Hinglish.
Handwritten notes · Part 11
26 pages of handwritten-style DSA notes for placements and coding interviews: Big-O, sliding window, two pointers, binary search, linked lists, trees, heaps, graphs, Dijkstra, union-find, greedy and dynamic programming, with clean C++ templates and Hinglish explanations.
Handwritten notes · Part 12
26 pages of handwritten-style aptitude notes for placement tests: speed maths, number system, percentages, profit and loss, interest, time and work, time speed distance, permutations, probability, series, coding-decoding, blood relations, directions, seating, syllogisms and clocks, with shortcuts, solved examples and Hinglish explanations.
Handwritten notes · Part 13
26 pages of handwritten-style system design notes for placements and interviews: a step-by-step answer framework, estimation, load balancers, caching, CDN, SQL vs NoSQL, replication, sharding, consistent hashing, CAP, Kafka, API design, rate limiting, microservices and reliability, plus case studies and a low-level design, with Hinglish explanations.
Handwritten notes · Part 14
26 pages of handwritten-style TypeScript notes for placements and interviews: basic types, any vs unknown vs never, type vs interface, narrowing, discriminated unions, generics, keyof, utility types, mapped and conditional types, classes, enums, tsconfig, React and Node with Zod, common errors and a type quiz, with Hinglish explanations.
Handwritten notes · Part 15
26 pages of handwritten-style Next.js 16 notes for placements and interviews: App Router, special files, dynamic and parallel routes, Server vs Client Components, data fetching and streaming, use cache, cacheLife and revalidation, Partial Prerendering, Server Actions, forms, route handlers, proxy, metadata and SEO, with Hinglish explanations.
Handwritten notes · Part 16
26 pages of handwritten-style C language notes for placements and interviews: compilation stages, data types and format specifiers, operators and precedence traps, functions and call by value, storage classes, arrays, strings, pointers, pointer arithmetic, const and function pointers, malloc and free, structure padding, bit manipulation, macros, file handling, undefined behaviour and an output quiz, with Hinglish explanations.
Handwritten notes · Part 17
26 pages of handwritten-style Git and GitHub notes for placements and interviews: the three areas, commits and Git internals, branches, merge vs rebase, merge conflicts, fetch vs pull, forks and pull requests, branching strategies, reset vs revert, stash, cherry-pick, reflog, bisect, commit messages and GitHub Actions, with Hinglish explanations.
Handwritten notes · Part 18
26 pages of handwritten-style HTML and CSS notes for placements and frontend interviews: how the browser renders, semantic HTML5, images, forms, accessibility, meta tags, specificity and the cascade, box model, units, position and z-index, Flexbox, Grid, centering, responsive design, pseudo-elements, animations, CSS variables and modern CSS, with Hinglish explanations.
Handwritten notes · Part 19
26 pages of handwritten-style AI, machine learning and generative AI notes for placements and interviews: ML types and workflow, regression, trees and ensembles, k-means and PCA, bias-variance, confusion matrix and F1, gradient descent, neural networks, CNN, RNN, transformers and attention, LLMs, prompt engineering, embeddings, RAG, agents and MCP, with Hinglish explanations.
Handwritten notes · Part 20
26 pages of handwritten-style Flutter and Dart notes for placements and interviews: Dart basics, null safety, OOP, mixins, records and sealed classes, Futures, Streams and isolates, Stateless vs Stateful widgets, the State lifecycle, widget, element and render trees, keys, layout, navigation, forms, state management, networking, performance, testing and release, with Hinglish explanations.
Top 50 interview questions · 4
Interview questions · Part 1
49 pages covering the 50 most-asked JavaScript interview questions, each with a short answer to say first and a detailed explanation: var/let/const, hoisting, closures, this, the event loop and output puzzles, promises and async/await, plus coding answers for debounce, throttle, deep clone, Promise.all, bind, curry, memoize and an LRU cache, with Hinglish explanations.
Interview questions · Part 2
56 pages covering the 50 most-asked C++ interview questions, each with a short answer to say first and a detailed answer with code, output and follow-ups: OOP, pointers vs references, virtual functions and vtable, virtual destructors, Rule of 3/5/0, smart pointers, RAII, STL, move semantics, output questions and coding questions, with Hinglish explanations.
Interview questions · Part 3
The 50 most-asked React interview questions with detailed answers, for freshers and developers with up to 2 years of experience: virtual DOM, keys, props vs state, every common hook, re-renders, reconciliation, Fiber, concurrent rendering, React 19 Actions, Server Components, hydration, performance, testing and four coding questions, with code, diagrams and Hinglish explanations.
Interview questions · Part 4
The 50 most-asked Node.js interview questions with detailed answers, for freshers and backend developers with up to 2 years of experience: the event loop, libuv, process.nextTick vs setImmediate, streams and backpressure, EventEmitter, cluster vs worker_threads vs child_process, Express middleware, JWT auth, Mongoose, graceful shutdown, testing, and coding and output-prediction questions, with code and Hinglish explanations.
FAQ
Yes. All 24 PDFs in the Placement Series (737 pages in total) are free. Preview sample pages on each resource page, then email Gaurav to request the complete PDF.
JavaScript, C++, React, Node.js, Python, SQL, Operating System, Computer Networks, OOPs, Java, DSA, Aptitude, System Design, TypeScript, Next.js, C, Git & GitHub, HTML & CSS, AI / ML and Flutter. Each PDF has about 26 pages with one concept per page, solved examples, interview questions and a revision cheat sheet.
Yes. The Top 50 Interview Questions PDFs (JavaScript, C++, React and Node.js so far) give each question a short answer to say in the interview and a detailed answer with code, outputs and common traps. New subjects are added regularly.
Start with Aptitude and DSA in one language (C++, Java or Python), since online assessments test those first. Then cover the core CS subjects interviews ask about: OOPs, DBMS and SQL, Operating Systems and Computer Networks. For web or full-stack roles add JavaScript, TypeScript, React, Node.js and Next.js, and learn System Design basics for product companies.
English, with short Hinglish (Hindi written in English letters) explanations in highlighted boxes wherever a concept is easier to understand that way.
Gaurav Sharma, a Full Stack, Flutter & AI Engineer with a B.Tech in Computer Science Engineering from JECRC University (2026). Every page is checked by hand: worked examples, outputs and code.
