Health, you ought to pay attention . All your questions were previously addressed. HS is only done b’dieved because of the secular laws and the fact many baalei batim would place their children in a worse environment if there were no secular studies in HS.
Secondly, *I* didn’t say college is assur. Rav Moshe Feinstein, Rav Ahron Kotler, etc. etc. did. I merely quoted them. You can learn about anatomy and mathematics, for example, since you need those areas for Torah study – not necessarily parnassa. You don’t need college for parnasssa. Even the goyim acknowledge that.
I explained in an earlier comment Rav Ahron’s shitta on secular studies and how it applies to his talmidim’s yeshivos.