Hello
OUAT Eligibility Criteria 2018.
Age Limit: The candidate must have complete 17 years of age.
10+2 passed with Science subjects with minimum 50% aggregate marks (40% for SC/ST/PH candidates). 10+2 passed with Science subjects withminimum50% aggregate marks (40% for SC/ST/PH candidates).
Goodluck I hope this helps you

67 percent marks in OUAt is safe score for all top colleges.

List of cutoff for all courses in Bsc sharedbelow.

https://www.iaspaper.net/ouat-cut-off-mark/
Cutoff generally varies from every year depending upon total students appeared and their performance and exam difficulty level.