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

Context Engineering

Tokenization & Embeddings3

Attention & the Context Window4

Self-attention, explained without the jargon
The full math of attention, worked by hand
Why context windows cost quadratically (and what the KV cache does about it)
How a model knows word order at all

Prompt & Context Construction4

Retrieval-Augmented Context5

Memory & Long Context4

Advanced Context Engineering7

Evaluation & Scoring6

Context Designing7

Lessons

Contribute, invite only

Context Engineering

Tokenization & Embeddings3

Attention & the Context Window4

Self-attention, explained without the jargon
The full math of attention, worked by hand
Why context windows cost quadratically (and what the KV cache does about it)
How a model knows word order at all

Prompt & Context Construction4

Retrieval-Augmented Context5

Memory & Long Context4

Advanced Context Engineering7

Evaluation & Scoring6

Context Designing7

Learn Context Engineering Attention & the Context Window

Contribute, invite only

Self-attention, explained without the jargon

The core trick that lets a model figure out which words in a sentence matter to which other words — the mechanism that actually reads your context window.

10 min readUpdated 2026-09-03context-engineeringattentiontransformers