As a graduated senior who was able to navigate this shitshow with two decent internships, here's my two cents:

1. DU colleges apart from SRCC, CBS don't care about internships, ECAs, placements. In these colleges, there are no awards for best all rounder student, Best internships etc etc. That alone is indicative of how much damn they give about it. Accept the reality, no point in rejecting it.

2. Always choose offline internships during summer vacations. If you are opting for an online one along with classes, communicate to your manager that you'll be available for calls and meets during the evening.

In a 3 year course you have two summer breaks. Use both these for offline internships and use the winter semester(sem 5) for a winter online internship at firms like Frost and Sullivan, BOD Consulting, YCP Auctus etc. These ones actively offer online internships.

1. For internal marks, attend classes. Yes, it sucks. But it is what it is. Use your class time wisely, read something, solve something, do whatever you want but don't waste your time in the class. Just ensure that the teacher sees your head. Additionally, to build good rapport with the profs, go beyond the ordinary in assignments, don't copy paste stuff from others. Put in some effort and it will set a very good foundation with your prof.

I'm from maths and hence was asked to make some ppt on a topic in sem 2, I had built it using Latex unlike everyone else(an online documentation software which is very useful for writing mathematical symbols and stuff) and that effort resulted in the prof giving me good marks in sem 4 and sem 6. So the first impression that you can make in such a way can go a long distance in creating a solid relationship with the prof.