According to the Revised CLAT 2018 Calendar 28–30th June, 2018 (Thursday-Saturday) has been reserved for Payment of full fees by the Candidates whose name appear for the first time in the third allotment list to the allotted Universities and Candidates to complete the admission formalities at the allotted NLU’s for admission against the allotment list.

Hello Shrishti,
you can get detailed information about this @ CLAT Counselling 2018.

I hope it helps!