Yes you can, but your scholarship will NOT be activated until your DODMERB waiver is granted. DS needed a waiver and went to NROTC NSI training and reported to school and began classes with the unit while awaiting waivers. He was responsible for everything financially until his waiver was granted. He paid for books out of pocket to begin school. He received his waiver at the end of the first semester and his scholarship was funded. The only thing that was not paid was back pay for his monthly stipend. Check with your schools bursars office on when your tuition is due and has to be paid in full.
Biggest most important thing you can do is to make sure you listen to the advise of
@MullenLE and sit down and go over the DODMERB instructions carefully and fully understand the information they are requesting.