Hey Ganesh !

GATE has it's minimum eligibility criteria to be a student of 3rd Year. You can surely apply for the GATE Examination 2020 with your current 7th Semester Marks, because by the time you appear for GATE and the results are out, you would have received your 8th Semester Marklist and certificate necessary for the admission procedure. Be assured and apply for the 2020 Exam Session.

Hope this helps.

Good Luck !