Hii pooja,

I hope you fine.i can understand your problem. CSE is overall depends on programing and logical thinking.ECE is related to bits,chips etc.and you can get to job in ISRO

1) first you join CSE otherwise you crack ISRO exam and (  4 research exams).you must focus on core subjects and maths.no need to worry about statistics it's a part in engineering.

2)same ECE also .but,it's low oppurtinty to get job in ISRO.

I hope you understand.

Thankyou.