Hi Aastha 

Computer science is among the most popular and carrier oriented branches of Engineering.

This branch of Engineering studies parts of computer science and electrical engineering and applied it for developing  computers and computer based systems, PCs , workstations, supercomputer. 

Also you can make computer based systems found in phones, electronic appliances etc. 

Your educational career in computer science starts after class 10.

- BTech in computer engineering requires class 12 in Science stream with PCM ( physics, chemistry, maths)

Selection is done on the basis of entrance test conducted at national and state level ( JEE, AIEEE, BITSAT etc)

- subjects you'll study in computer science engineering: 

Probability theory

C++ and data structures

Data structures

Discrete mathematics

Computer organisation and Architecture

Operating systems

Database management

Digital electronics

Artificial intelligence

Cryptography and network security

Information and coding theory

Computer graphics

Machine learning

Computational geometry

Quantum computing

VLSI design and testing

Simulation and modelling 

Other programming languages like C, C++, java etc

All The Best!!

Hello Aastha,

Following are some of the subjects that are required to study in computer science. These are some of the subjects which you will study in computer science engineering. 

Design and Analysis of algorithms 

Digital electronics

Artificial Intelligence 

Database Management System

C++, java, python

Computer graphics

System software

Cloud Computing 

Micro processor and micro controller

Automatic control systems 

The list above is exclusive..  there are lot more subjects to study in this field.

 I wish you all the best.