Answer:
"After finish high school, you may want to start looking for colleges you may want to attend in the near future. If you have mastery at a subject then that can help further in your college letter, You may work your way into your masters degree"
Explanation:
add a bit more details: talk about how college would be helpful and how highschool credits will come in handy.
The prepositional phrase is "after the test"
Either on and off campus experience or living at home, in a dorm, and in apartment.
You can chose on what you think is the best.
Maybe someone else can help us both