I would postpone the interview. Give yourself at least 2 months to study this stuff. If you can't postpone it, then I would go ahead and do the interview anyway

I would postpone the interview. Give yourself at least 2 months to study this stuff. If you can't postpone it, then I would go ahead and do the interview anyway. There are some good suggestions below, try to spend at least a few hours each day. Hopefully a few hours in the morning, then a break, and then a few more hours. Get plenty of sleep. When you do the interview, do your best and try not to care about the outcome. If you don't care about the outcome, you won't be nervous and you'll likely do better.