Hello Aspirant, several colleges of Gujrat state like NIRMA university, GEC Surat etc. are taking admission on the basis of JEE mains 2021 scores . Those colleges accepting JEE mains score will prepare a merit list based on AIR of students who have filled admission form for the respective colleges and based on the merit list admissions will be made. GUJCET 2021 is expected  be held in June 2021. After the exam is held some colleges will also consider GUJCET scores for admission. So in short keep checking the official websites of the colleges you want to apply to know about the admission process that they have decided to follow.

BEST OF LUCK!!