which is the best field in engineering other than computer science?

I would say better to consider your interest and potential before you choose any branch as it depends on that only but yes, CS is one of the most demanding branch among students as there are 40+ other branches also available you can check the same below -
Computer Science Engineering
Mechanical Engineering
Information Technology
ELECTRICAL ENGINEERING
ELECTRONICS ENGINEERING
Electronics and Communication Engineering
CIVIL ENGINEERING
CHEMICAL ENGINEERING
AEROSPACE ENGINEERING
BIOMEDICAL ENGINEERING
AUTOMOTIVE ENGINEERING
STRUCTURAL ENGINEERING
ARCHITECTURAL ENGINEERING
MECHATRONICS ENGINEERING
ROBOTICS ENGINEERING
PETROLEUM ENGINEERING
GEOLOGICAL ENGINEERING
NUCLEAR ENGINEERING
MARINE ENGINEERING
NANOTECHNOLOGY ENGINEERING
MINING ENGINEERING etc.

To check the complete list, you can g through the below link -

List of Engineering Courses having B.E /Btech degree in India

Hope this helps!!!

All the branches are good in engineering it totally depends on your interest and passion. You should choose the branch according to your interest.

If we compare the branches then ECE has good scope followed by mechanical, civil, electrical and IT.

You should concentrate in your study to get good college. Always select a college with good placements. If you choose a top branch in average college then it is of no use as there will be no placements.

Try to score good marks in your exam to get top colleges like NITs and IITs.

Good Luck!!