i am sc caste boy i am qualified in jee mains is colleges free or fee

Dear aspirant,

You have qualified JEE Mains. So, you are eligible to write JEE Advanced.

If you get into any NITs/IITs/IISER/IISc (the centrally funded institutions) with your JEE rank, you'll get a complete tuition fee waiver. This is not available at all institutions that take JEE mains rank into account. Some institutions do offer a fee waiver to some extent or scholarship of some amount.  Even though, you have a 100 percent tuition fee waiver , you'll have to pay fee for mess, hostel and other amenities.

Hope this helps.