Computer Science & Engineering vs Borderwalk

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.

Fill in a world map by learning it. Every country you know lights up, and the ones beside it open. You don't jump. You walk — from home, one border at a time, sailing when the land runs out — and Borderwalk brings each country back just before you'd forget it. All 197 countries, fully offline, with no ads and no subscription. Nothing that teaches is for sale. Lessons adapt to what you're about to forget, and they don't just ask what a capital is. They ask which countries border this one, which of these is furthest north, put these four in order. That is the difference between flashcards and knowing where you are. HOW IT WORKS • 3-minute lessons with spaced repetition: review exactly when it counts • 197 countries × 6 facts: capitals, flags, shapes, locations, names and how they sit beside each other • The map is the app. Not a tab, but the thing you look at all the time • A frontier that grows: fogged, then on the horizon, then yours in bronze, silver, gold. Neglect a region and it fades; a review brings it back • Pinch out past the world and the map becomes a globe. Spin it, tap any country, land on it. The same map, wrapped onto a planet • Fly anywhere: tap a fogged country and go. The first flight is free. Learn it, and a new frontier grows from there • Expeditions: the Silk Road, the Andes, the Danube, walked one country a lesson, with a picture of the walk at the end • A living planet: a real sun moves day and night across the map, and the countries you know light up at night. Forget one and it wears weather • Eight region soundscapes that follow where you look, and Pip, a small warm voice for the moments that matter • Hear every country and capital said aloud, wherever a name is printed • Twenty-one companions, one a region, met and bonded by mastery. No boosts, no stats, just company • Pin It: a city, a blank map, seven seconds. Drop your pin as close as you can. Five shields, a second look on a far miss, endless waves • A passport of chops: 197 hand-drawn marks, one a country, bronze, silver or gold as you master it, a postcard on the first stamp, and full-page visas for whole continents • A Country Dossier you EARN: ten pages a country. Its capital, its bearings from home, the flags it is confused with, its borders, its people and money, opened page by page by what you have actually learned. The gate is the learning, never a price • Today in every country: the time in its capital right now, when the sun rises there, today's public holiday, and one thing that happened there on this day of the year • The day that made it: a narrated story for every one of the 197, told over music that fits the moment, yours from the day you earn the stamp • Master a country and its flag flies on the map, and on the globe, leaning as it rounds the edge, dark on the night side • Streaks with freezes, three daily quests, a streak calendar, gems, chests, combos and a Double-XP boost, and a scarf shop for Pip to spend gems in • Daily Challenge: the whole world gets the same 7 questions. Share your no-spoiler result grid • A home-screen widget that is a planet: your countries, lit at night RACE THE WORLD (optional, needs a free account) • Weekly leagues: a fresh cohort every Monday, promote or hold your tier • Duels: challenge a friend to the same five questions, head to head • Follow friends and compare the week on a private leaderboard MADE TO RESPECT YOU • Works fully offline: every lesson, every map, every story, no account • No ads. No tracking. Nothing that teaches is ever for sale • There is an Explorer's Pass if you want to support the app, and a tip jar. Both optional, and neither unlocks a single question • Color-blind friendly palette and full Dynamic Type support • Under-13? Borderwalk runs fully local with notifications and analytics off. Start with your home country. One lesson, one stamp, and 196 to go.