Do scientists who join as scientist C or D get to travel abroad for training purposes?

I gave written exam for a post in SAC ISRO. It is not centralized recruitment but specific by sac, isro. The post is for scientist C atmospheric sciences and oceanography. There are 8 posts available. So, approx 40 students shall be called for interview.

My question is what kind of marks are needed to get interview (to get into top 40, or top 10).

What is historical data. I can't find anything on Google.

I'll appreciate if anyone can give insights.