At my guard unit...you have to have 90 credits to go to OTS, UPT. They will review your packet which includes your transcript...if the rest of it looks good, they usually have no problem giving you an interview. (Age is usually an issue ie. if you're 20 yrs old they'll tell you to come back in a few years.) After that, it's not really an issue. If you are selected, you have to request to the board a education waiver which they will give you since they just hired you.
Been there, done that
believe it!