We had a wonderful deal in Florida. Alas, it is no more. St. Leo University
in Tampa gave re-cert classes every June which was 3 credits earned in one
week. Classes were 8 hours for 5 days.We had pre-class research at home before
the first class. Midterms were the third day. Finals on Friday. In the
middle of it, we did assignments. It was a bear but worth the intense work to get
the 3 collede credits.
Maybe your state has a university that does a similar thing?