Hi, Swarnadipa.

Your question is good at same time too general. I have absolutely no idea of your academic or social background or the reason behind you to follow engineering and the branch of Electronics and Instrumentation.

Engineering is an applied science. From the childhood whatever you studied and assimilated, directly or indirectly deserves to be applied in real life, be it physics, chemistry, mathematics, biology, geography, language everything. You will certainly appreciate what I stated now, someday or other.

If you already have an aptitude for applications, like doing projects, troubleshooting, designing small things it is great. If not then give lots of emphasis now onwards on projects as much as possible, may be beyond you syllabus requirement. Do enough of study to make your project strong on foundation. Do not copy somebodies project. It ruins your best route to learning.  If possible do some personal projects. Try to complete all projects and demonstrate its functionality. Think of its enhancement and take it forward whenever possible.

Your branch selection is little tricky. As a matter of fact Instrumentation is very vast subject and extremely multidisciplinary. If involves every aspects of science and every aspects of engineering be it mechanical, electrical and above all chemical engineering. The instrumentation branch was created to cater to mainly process industry i.e chemical plants, power plants etc. But I have found students straying away from the very basics of Instrumentation. The reason is with the advancement of electronics and digital systems, basics of Instrumentation has taken a back seat and the branch has become a de facto electronics course. So you have to take a conscious decision whether to become electronics engineer or computer/software engineer or a hard-core instrumentation engineer.

I am not updated with the current state of affair of Instrumentation curriculum, but i feel it must be stagnating and shifting towards electronics only. Also colleges do not have right infrastructure to impart hands on training in instrumentation. True instrumentation engineers need to understand Control Systems thoroughly, process control and real life actuators like control valves . In real life Instrumentation engineers learn all these aspects while working on job. If you get any opportunity to have hands on training try to get a good industry and utilize the opportunity to the fullest.

Due the fact West Bengal has very few or no process industry, instrumentation engineers may not find any job there. You have to leave West Bengal to get a Instrumentation engineer's job. So decide what is your target.

In any case give lots of emphasis on good projects. Develop good writing skill, strengthen your communication skill particularly English speaking.  In many recruitment interviews I have observed students from Bengal lack good English speaking skill. Do not ignore mathematics. It will come handy if you are going for design or consultancy services.

If you have more specific query you are welcome.
All the best for you future success