Computer Science & Engineering vs BIT

Computer Science Engineering puts a complete CSE course in your pocket: 84 subjects, 425 tutorials and 8,891 lessons covering the full computer science and engineering syllabus, in plain language. Revising for an exam, preparing for a technical interview, or starting from scratch? Every core subject is here, and all of it works offline. WHAT YOU WILL LEARN Data Structures and Algorithms — arrays, linked lists, stacks, queues, trees, graphs, hash tables, sorting, searching, greedy methods, dynamic programming and complexity analysis. Database Management Systems — relational models, SQL, normalization, ER diagrams, transactions, indexing and an introduction to NoSQL. Operating Systems — processes and threads, CPU scheduling, deadlocks, memory management, virtual memory, paging and file systems. Computer Networks — OSI and TCP/IP models, routing, switching, IP addressing, subnetting, HTTP, DNS and network security basics. Computer Architecture — processor design, instruction sets, pipelining, cache memory, memory hierarchy and I/O systems. Programming — core concepts with worked examples in C, C++, Java and Python, plus object oriented programming, recursion and exception handling. Software Engineering — development life cycle, agile methods, testing strategies, design patterns and version control. Theory of Computation and Compiler Design — automata, regular languages, context free grammars, lexical analysis, parsing and code generation. PRACTICE, NOT JUST READING 26,874 quiz questions covering every subject. Each session is ten questions with four options and a timer, drawn from the chapter you have been studying. Three difficulty levels: beginner 30 seconds per question, intermediate 20, expert 10. A full session runs 5:00, 3:20 or 1:40. Pass at 70% or above. Filter by level, by what you have attempted, and by your best score, so revision targets your weak subjects. Every attempt is saved to your history. INTERVIEW PREPARATION 25 technical interview roles with 100 questions each — 2,500 in total — built around what campus placements and technical interviews actually ask. Same timed format, same pass mark, same saved history. STUDY OFFLINE Download any subject for offline reading. Lesson text is stored on the device, so the syllabus stays available on a bus, in a lecture hall, during a power cut, or anywhere mobile data does not reach. Images still need a connection. Opened lessons are cached automatically, so anything you have already read stays readable even if you never hit download. The Downloads screen shows what is stored, how much space it uses, and lets you cancel, resume or remove any subject. TRACK PROGRESS, EARN A CERTIFICATE Mark lessons complete and watch the progress percentage climb on every subject. The Continue card on the home screen drops you back exactly where you stopped. A daily reading streak counts every day you study, with an optional reminder that is off by default. Complete every lesson in a subject and pass its quiz at 70% or above to unlock a certificate you can save and share. BUILT FOR HOW STUDENTS STUDY Short sections you can finish in a few minutes. Syntax highlighted code with one tap copy. Search across the whole syllabus. Bookmarks and history. Light, dark and system themes, adjustable font size, and a choice of where the previous and next buttons sit. Proper tablet layouts, not stretched phone screens. WHO IT IS FOR CSE students revising for exams, candidates preparing for competitive examinations and campus placements, developers refreshing fundamentals before interviews, and career changers moving into software. Frameworks change every year. Data structures, algorithms, operating systems and networking do not. No video to buffer. No account to create. Open your first tutorial in under a minute. Questions, corrections or a topic request? Email mail@ehsanur.com — we update the app based on what learners ask for.

BIT turns computer science fundamentals into an endless puzzle game — not flashcards, not video lectures, just real questions with real answers, one after another. WHAT'S INSIDE Play — An endless stream of puzzles drawn from everything you've learned, weighted toward what you're starting to forget. Build a streak, chain a combo, and watch a running total climb. Explore — Every concept BIT teaches, organized like a real curriculum: prerequisites, learning objectives, worked examples, and real-world uses. From what a bit actually is, through binary arithmetic, arrays, linked lists, sorting, searching, and networking basics. Build — Hands-on projects where you actually build something: wire up a binary counter, construct an array from scratch, and see the concept work, not just read about it. Lab — Interactive playgrounds for experimenting freely with the ideas Play and Explore introduce. Puzzle of the Day — One challenge, the same for everyone, every day. Solve it, share your result, keep your streak alive without committing to a full session. WHAT BIT DOESN'T DO No ads. No accounts. No leaderboards. No in-app purchases. No data collection of any kind — everything you do stays on your device. BIT works completely offline because it has to: there's no server to talk to in the first place. WHO IT'S FOR Students learning computer science for the first time, self-taught programmers filling in fundamentals they skipped, and anyone who likes the idea of a daily brain-training habit that leaves them knowing something real. New content is added regularly — more domains, more concepts, more puzzle types — as an ongoing project, not a finished product.