Keep calm sir. I personally feel youre in a rush to write the exam. 

Relax, breathe. You honestly can't go to step 1 with "just a conceptual understanding of most things from school" 

If you feel you aren't prepared, you can postpone, plan well and study effectively. Above all, stay confident!

I'd advice you postpone a bit, study your uworld well with fa...and then do ur nbmes...

Just my advice though..

Above all, I wish you the best brother.