Every person will have a different opinion on what advice work best for freshers. Instead of giving you a list of things to follow, I will suggest you just focus on 3 key points

1. Maintain your academics: The primary focus should be your academics and staying at the top of your class. Don’t let your CGP fall below 8 throughout your life at KGP.
2. Learn new things: This does not include just DC++, Counter-Strike, or FIFA. Explore new things such as workshops, society interviews, and sports, or take part in different inter-halls.
3. Make friends: Surviving in an IIT can be much easier with the right set of friends. To interact with your hostel buddies and make new friends that will stay with you for the rest of your life.

Overall, you need a highly positive mindset before joining IIT. You need to be passionate about things and be ready to work hard and achieve them.