The minimum eligibility criteria is 50% marks in 12th board and 70 marks out of 200 in NATA to apply at CEPT University.

50% of 12th score and 50% of your NATA score sums up to your merit.

There are total 80 seats for Bachelor of architecture, 40 for Gujarat students and 40 for All India students  entirely on merit basis.. You have a fair chance to get into CEPT with that score.