When you are being questioned by the CBP officer(s), you should answer each question as truthfully and briefly as possible. "Yes" or "no" answers are best, when appropriate.

I don't recommend getting into the issue of deferring your student status or anything like that, unless they prod you specifically (in which case, answer only the questions they ask, and do not volunteer additional information).

Anything you say in front of an officer could be used against you.