Skill Builder Practice Courses

Free, hands-on practice courses with MCQs and instant explanations. Drill the topics interviewers ask, track gaps with the AI guide, walk in ready.

40

Practice courses

59,400+

Practice MCQs

28,183

Learners

Learning tracks

Multi-course series that build on each other — pick a journey, practice every part.

Learning Series

ASIC Design Verification

A complete design verification practice track — from SystemVerilog and UVM to the AMBA protocols (APB, AHB, AXI), plus entry-level and FAANG-level interview prep. Seven courses of free MCQ practice for students, RTL engineers moving into verification, and working DV engineers.

7 courses·3.2k MCQs·116.5h

Start with Part 1

Learning Series

A complete C++ learning track on Abekus — from language fundamentals through modern C++11/14/17/20/23 features, the STL, and template metaprogramming. Free MCQ practice with instant explanations, designed as a progression: each course builds on the one before.

4 courses·5.1k MCQs·61h

Start with Part 1

Learning Series

A complete Data Structures & Algorithms track on Abekus — from data-structure fundamentals through algorithmic patterns, dynamic programming and graphs, and interview-mastery mixed problems. Free MCQ practice with instant explanations, designed as a progression: each course builds on the one before

4 courses·5.0k MCQs·69h

Start with Part 1

Learning Series

A complete Java learning track on Abekus — from language fundamentals through Collections, Streams, Functional Programming, Concurrency, JVM internals, and Interview Mastery. Free MCQ practice with instant explanations across every topic the language hinges on, designed as a progression: each course builds on the one before.

7 courses·13k MCQs·170.5h

Start with Part 1

Learning Series

JavaScript Mastery

A complete JavaScript learning track — from core language mechanics and ES6+ syntax through async patterns and advanced features.

3 courses·3.7k MCQs·49.5h

Start with Part 1

Learning Series

Learn React from JSX through Concurrent React 18, Server Components, and the patterns senior interviews probe. Two courses: Fundamentals for the foundations, Advanced Patterns for the depth.

2 courses·2.4k MCQs·31.5h

Start with Part 1

Learning Series

Spring Boot Mastery

A Spring Boot learning track — from Spring Boot fundamentals through security and advanced patterns. Free MCQ practice with instant explanations across the framework most JVM backend roles run on. Assumes working Java; pairs with the Java Mastery track.

2 courses·2.6k MCQs·36h

Start with Part 1

24 of 40 courses

DV Interview Mastery: Staff & FAANG-Level

Prepare for senior and FAANG-level design verification interviews with 1,500+ free MCQs on architecture, RAL, AXI corner cases, debug and coverage.

5.0181,092 MCQs17.5h

Python

Learn Python online with 3,400+ free practice MCQs — from variables and control flow through OOP, concurrency, memory, performance, and interview traps.…

4.69,8332,619 MCQs33.5h

GenAI Engineering: Prompt Engineering

Master prompt engineering with 1,400+ free practice MCQs — zero/few-shot, chain of thought, ReAct, structured output, prompt injection. Instant explanations.

GenAI Engineering: Agents & Mastery

Master AI Agents with 1,600+ free practice MCQs — tool calling, ReAct, multi-agent, memory, MCP & A2A, agent safety. Instant explanations.

Go Concurrency & Advanced Patterns

1,300+ free MCQs on Go concurrency — goroutines, channels, select, sync primitives, context, the memory model, and race patterns. Instant explanations.

C: Pointers & Memory Mastery

Drill C pointers and memory with 1,300+ free MCQs — multi-level pointers, function pointers, dynamic allocation, struct padding, UB, and safe patterns.

1,097 MCQs14.5h

GenAI Engineering: RAG Systems

Master Retrieval-Augmented Generation with 1,500+ free practice MCQs — chunking, embeddings, hybrid retrieval, reranking, eval. Instant explanations.

HTML & CSS for Frontend Interviews

1,000+ free MCQs on HTML & CSS for frontend interviews — semantics, accessibility, Flexbox, Grid, modern CSS. Instant explanations after every wrong answer.

261,045 MCQs11h

Next.js Fundamentals

Learn Next.js with 1,200+ free MCQs — App Router, Server Components, Server Actions, caching, and SEO. Instant explanations after every wrong answer.

151,230 MCQs13h

Python Interview Mastery

Crack Python interviews with 900+ free MCQs focused on traps, edge cases, and internals — instant explanations after every wrong answer.

3.066787 MCQs10h

GenAI Engineering: LLM Foundations

Master Large Language Models with 1,700+ free practice MCQs — tokenization, transformers, decoding, alignment. Instant explanations on every wrong answer.

DSA — Interview Mastery

Practice interview-mastery DSA with 1,500+ free MCQs — segment trees, Fenwick trees, string algorithms, probabilistic DS, advanced heaps, number theory, edge cases, complexity trade-offs, archetypes, and anti-patterns. The DSA capstone.

241,237 MCQs17h

DSA — Dynamic Programming & Graphs

Practice DP and graph algorithms online with 1,500+ free MCQs — state definition, 1D and 2D DP, Knapsack, sequence DP, shortest paths, MST, topological sort, and advanced graph algorithms. Hard-interview ready.

31,292 MCQs17.5h

DSA — Algorithms & Core Patterns

Practice DSA algorithms online with 1,700+ free MCQs — sorting, binary search, recursion, backtracking, greedy, two-pointer, sliding window, prefix sums, BFS/DFS, monotonic stack, and bit manipulation. Pattern-driven, interview-ready prep.

DSA: Data Structures Fundamentals

Practice data structures online with 1,400+ free MCQs — from arrays and hashmaps through linked lists, trees, heaps, tries, and graphs. Instant explanations on every wrong answer; FAANG, GATE, and campus-placement ready.

TypeScript Fundamentals

Practice TypeScript online with 1,600+ free MCQs — from type annotations and interfaces through generics, utility types, narrowing, and tsconfig. Instant explanations on every wrong answer; React, Node, and interview-ready prep.

111,275 MCQs16h

Spring Boot: Security & Advanced

Master Spring Boot Security & advanced topics with 1,600+ free practice MCQs — Spring Security, JWT, OAuth2, Actuator, caching, async, Kafka & RabbitMQ.…

101,364 MCQs18.5h

C Programming Fundamentals

Practice C programming online with 1,800+ free MCQs — from basics and operators through pointers, dynamic memory, structures, and file I/O. Instant…

51,525 MCQs18.5h

Logical Reasoning

Practice logical reasoning online with 3,300+ free MCQs — from series, coding, and blood relations through seating, puzzles, and critical reasoning.…

4.27963,346 MCQs32.5h

Spring Boot Fundamentals

Learn Spring Boot from scratch with 1,500+ free practice MCQs — IoC and DI, beans, auto-configuration, REST controllers, Spring Data JPA, exception…

181,263 MCQs17.5h

C++ Templates & Advanced

Master advanced C++ templates with 1,400+ free MCQs — type deduction, specialization, variadic templates, SFINAE, type traits, C++20 concepts, CRTP…

1,009 MCQs15.5h

C++ STL Mastery

Master the C++ Standard Template Library with 1,400+ free practice MCQs — vector, deque, set, map, unordered_map, stack, priority_queue, iterators…

31,238 MCQs16.5h

C++ Fundamentals

Master the fundamentals of C++ with hands-on practice covering syntax, OOP, memory management, and the STL.

C++ Modern Features

Master modern C++ with 2,000+ free practice MCQs — auto, lambdas, move semantics, smart pointers, constexpr, std::optional, std::variant, structured…