i dunno.. he sounds unreasonable. But there are only two ways:

1> Either tyou go out and do the job regardless of what he says.

2> Reason with him. If you can't have someone who can talk to him. If it works on your father, give examples of all the kids your age who are out doing stuff...

either ways.. you have to figure out yourself... this is actually a good test! If you can make a deal with him, you are ready to go out!
Also, you mentioned that your dad is afraid that you are going to end up walking his path. Tell him that you are not him. That you have learned to prioritize. That ppl at EP will kick your butt if you drop out before two months after you graduation.