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

Computer Organization & Architecture

Foundations of Computing7

Instruction Set Architecture5

Datapath & Control Unit4

The ALU: the calculator hiding inside every CPU
The datapath: wiring the register file, ALU and memory together
The control unit: the conductor that sets every switch
How does a CPU actually multiply and divide?

Instruction Pipelining4

Memory Hierarchy7

I/O Interfaces & Interrupts5

Boot to Execution: The Full System Trace5

Lessons

Contribute, invite only

Computer Organization & Architecture

Foundations of Computing7

Instruction Set Architecture5

Datapath & Control Unit4

The ALU: the calculator hiding inside every CPU
The datapath: wiring the register file, ALU and memory together
The control unit: the conductor that sets every switch
How does a CPU actually multiply and divide?

Instruction Pipelining4

Memory Hierarchy7

I/O Interfaces & Interrupts5

Boot to Execution: The Full System Trace5

Learn Computer Organization & Architecture Datapath & Control Unit

Contribute, invite only

The ALU: the calculator hiding inside every CPU

The Arithmetic Logic Unit is the one circuit that actually computes things. Here's how it's built, and how a single opcode picks between add, subtract, AND, OR and more.

11 min readUpdated 2026-09-03computer-architecturealudatapath