Hi aspirant, after declaration of result suppose now you have got 80.4 percentile  after declaration of result one should choose wether they want to go forward for JEE Adavance or they should fill the counselling form for counselling on behalf of JEE Mains msrks after appering in counselling and verification of your documents you will be alloted a seat in any college. After that you need to visit the college to confirm the presence and thus you become a college student. That's it.

Good Luck.