This podcast recaps the top 3 books I used when studying for the boards and in my career now as a BCBA. I have the books and resources linked below:

Cooper Text (I have the 2nd edition but if you ate studying, get the 3rd edition as that is what the exam is based on. I linked the 3rd edition here)

Cooper Companion Site (This one is for the 2nd edition. Although the test is on the 3rd edition, a lot of the basic vocabulary and concepts are the same in the two texts and it can still be helpful)

Bailey and Burch Ethics Books

Bailey and Burch Student Workbook

Behavior Speak