OP also about Questbridge, you are right that Match opens in the late summer as you begin senior year, but pre-college program for juniors and is probably already open. Due date is mid-spring. It would be very helpful for you to do pre-college because it would walk you thru a lot of the admissions and financial aid info so that you can form strategies which would suit your particular situation.
Also myos1634’s post is right on about the support you would get as an HEOP student.