Hello,
You have to study as per the syllabus. There might be provision of Hons. or minor. Hons. is studying additional Self- branch subject. Minor means you have to study a subject which belong to other branch.
You can take hons. which will help in lot of factors. ISRO jon requirements:- 75% throughout percentage. You have to be good coder. Must have analytical skills. This is 2-3 step process of selection. For CSE, coding is must. Must have clear concet on Basic subjects. Most of the subject you will study in 2nd year is like root of CSE. 3rd year is root of advance technologies and 4rth year is where you use those knowledge for making projects and some advance subject in theory.
so every subject is important and having a good concept is important. ISRO provides good posts. if you win the competitive exams then you will get more recognition and high package salary.
Hope it helps!
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