Can I change to active duty while in BOLC?

You can request active duty at anytime while in a Reserve Status, BOLC and Beyond but there has to be a program in lace to take on officers for AD, usually shortage based Branches that fall victim to attrition, lack of OCS/Direct Commission numbers oanning out and of course, have a stellar packet with solid OERs, APFT score, extra curricular, academics, job experience and some (3plus) Letters of reccendation of officers Field Grade and above saying that you are capable, competent and have the potential to serve on AD if appointed. I had three Cadets a few years ago do this, the process starts with HRC, they change the names of the programs often, but a packet requesting AD can be forwarded through your USAR/NG Strength Officer Manager (most wont have a clue what your doing) and best bet is to contact the HRC AD Branch Manager for your Branch and a start asking the questions with them and they should be able to get you the answers. If a named program is not in place it’s much harder, but still-nothing is impossible if you work hard and keep trying in our Military, you’re not a marginal performer and you work in and through the system to find the waiver needed to make your mission a reality...

God Speed

There is a remote chance the AD might snipe you from the Reserves. While I was in BOLC AD reps came into my BOLC class and said anyone that is USAR and graduates BOLC here (Quartermaster) can get on Active for 3 years. So, technically not going "Active" but essentially extended ADOS for three years assigned to AD units. Then of course they would release us back to the reserves once done with us before we were in a position to be CPT's. Depends on your Branch of course.

I don't know what contract you signed, but in general, I would say no. If you signed a Reserve or Guard contract, they have put out the money for your training and are counting on you filling a slot on their UMR. So unless there is some backdoor method of switching components while in a training status, I think you need to concentrate on your training rather than breaking your contract.