Connect with fellow learners in the PlacePrep Discord communityㆍ Join now →

R's PlacePrep

Popular drives

TCSNQT (National Qualifier Test)InfosysIRT (InfyTQ Recruitment Test)AccentureCognitive & Technical Assessment

Also hiring

WiproNLTH (National Level Talent Hunt)CognizantGenC Assessment CapgeminiGame-Based Assessment

Browse all 14 companies TCS NQT 2026

Real placement papers from the drives you are actually sitting for

14 companies · 48 papersStart practising

Select your branch

Computer Science & EngineeringBEU previous year papers and solutions Mechanical EngineeringBEU previous year papers and solutions Electrical & Electronics EngineeringBEU previous year papers and solutions

More branches

Civil EngineeringBEU previous year papers and solutions Aeronautical EngineeringBEU previous year papers and solutions

All branches Computer Science

Previous year questions

University papers, sorted by subject and year with worked solutions

BEU Solved PapersOpen the archive

Core CS

Data Structures & AlgorithmsComplexity analysis up to graphs and DP.Operating SystemsProcesses, scheduling, memory and concurrency.Database Management SystemsRelational modelling, transactions and indexing.Computer NetworksFrom wires and radio waves up to the web.

Learn & scale

AI Inference EngineeringQuantization, batching and KV caching in production.System DesignScalable systems from first principles.Context EngineeringDesigning the context that LLMs actually reason over.Docker & KubernetesContainers and orchestration, explained.

All 15 courses Authors

Structured courses that start at zero and end somewhere useful

15 courses · free foreverBrowse courses

Companies PYQ Learn

SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

ACID and transactions: the four promises every database makes
Concurrency and isolation levels
Query execution and EXPLAIN: seeing what the database actually does
Performance tuning, hands-on: fixing a genuinely slow query

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Lessons

Contribute, invite only

SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

ACID and transactions: the four promises every database makes
Concurrency and isolation levels
Query execution and EXPLAIN: seeing what the database actually does
Performance tuning, hands-on: fixing a genuinely slow query

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Learn SQL & Databases Transactions & Performance

Contribute, invite only

Query execution and EXPLAIN: seeing what the database actually does

How a SQL query becomes a physical execution plan, reading EXPLAIN output, and the join algorithms the planner picks between.

12 min readUpdated 2026-09-04performanceexplainquery-planningadvanced