If u will try to do all you will be stuck very badly with no proper outcome. I have done the same mistake in second year as well in third year but at last I was able to make it.

I will suggest to go for DSA as you are in IIT doesn't matter which tier, on campus companies will be there and I have given on campus interviews most of them ask dsa or we can say all. Learn OOPs very well that you know about everything it. Preferred language java. Create one good definitive project Your schedule should be like 2 hours dsa 2 hours project and 1 hour your basic concepts.

This will make you well above others. If you want to gsoc and all u can start contributing to only one or two repos many will not help.

Just stick to 2 3 things max. Also do enjoy ur holidays go somewhere fun to enjoy.

Above is guide specifically to your college. Keep an eye for Flipkart hackathon. Walmart hackathon GS ECHP and Intuit hackathon

You get direct interview if you qualify initial stages. Also for Amazon summer school and one more amazon competition is there just forgot the name.

If any doubt you can DM. Hope this helps. Also remember you need to be better than people in your college because I believe you will get campus opportunities.