Mesivta Chaim Shlomo (Darchei) is an excellent choice. It is run by Rabbi Yaakov Bender, shlita. They have all kinds of programs for the bochurim. They offer AP courses for the boys. They definitely prepare you for college, though they will not encourage you to go. they also will not discourage you.
I know many boys that graduated from MCS, went to EY, came back and went to schools such as Harvard Law, NYU, etc. and they are all fine bnei Torah.