Check out CUNY schools such as Hunter or City. Hunter college, where I am currently registered as a postbacc, offers a late afternoon bio course. It starts at 5:35pm. They also offer a chemistry section during the weekend.
I am not up-to-date on City's course schedule, so you'll have to look for yourself. There are other CUNY campuses which offer these courses. If you choose to take courses at a CUNY school, beware the registration process can be extremely frustrating.
Hope this helps.