Be yourself, and be honest. You can even ask questions to the interviewer.
Is this for a selective college? Most colleges accept almost everyone who is capable of doing college level work, but the competition to slots in selective colleges is very tight and they use non-academic factors to pick their entering classes because they get many times the number of qualified applicants than they have space for. But just because it is prestigious and selective does not necessarily mean it is a good fit. YOU need to be convinced that THEY have the right environment for YOU. Don’t be arrogant about it, but be open and honest about the fact that you are looking for a place that is a good place for a frum Jew in addition to strong academics.
Good luck!