This is another reason why a man shouldn't seize the priesthood like he's trying to achieve some other goal (becoming a doctor or other professional, buying a house, paying off debts, etc.)
With most goals, obstacles are made to be overcome. NOT SO with the priesthood. If your seminary sends you away, more often than not you should give up (at least in the current state of the Church, where good Seminaries aren't "a dime a dozen" -- they're closer to "one of a kind")
Becoming a priest is one goal in which you have to include some "passivity" to what God wants.
On the other hand, you shouldn't be too willful in quitting, either. Make sure whatever happens is God's will, not yours. That means don't quit the seminary. Either get sent away, or get ordained. But while you're there, do your best to align your life to the seminary's rules, shutting out The World from your heart, etc.