Admission to JIIT Noida is offered through two ways- Class 12th marks and JEE mains score card.

Considering your case, you scored 77% in class 12th Examination and haven't appeared for JEE mains. You can still apply for JIIT since the eligibility criteria for admission in JIIT is scoring minimum of 60% in (10+2) broad examination with Physics, Chemistry and Maths as compulsory subjects.