edit

I would write him an e-mail and let him know you passed before you apply. Tell him you took his advice to heart and focused on the exam. Tell him some things you picked up from level 2 you didn’t know before. Show your progress and dedication.

thanks LXWarr… that’s probably the best tactful approach…

I would call him since you know him on a personal level. I’m not comfortable asking people for help either but in your situation, I would be direct with him. Tell him you are interested in working for his firm and ask for a recommendation. What you got to lose?