hi,

see you need to appear in josaa counselling to get admission in NITS, IIITS, GFTIS. however jee advance score is not needed to get admission in nits, iiits, gftis. for admission in iits, jee advance score is needed. you can not get admission in btech courses in iits with out appear in jee advance.  you must have the category wise cutoff score to appear in jee advance along with satisfying the  others eligibility criteria,

Candidates born on or after October 1, 1995 are only  eligible for JEE Advanced 2020. However, there is a relaxation of 5 years for SC, ST and PwD candidates (born on or after October 1, 1990).

applicants can have only consecutively  2 attempts starting from the year of passing of 12th course for jee advance .

Candidates who have been admitted in an IIT will not be eligible for JEE Advanced 2020, irrespective of whether he/she continued in the programme or not.

however You may use Careers360 college predictor tool to know your predictable colleges

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer