You cannot just assume that non-A levels will be accepted and you need to check with individual Unis.
Most top Uni will only accept ether an BTEC Extended Diploma or will only accept a 'single' BTEC with minimum 2 A levels. Remember that Crim is not an A level - whatever you school tells you - and some Unis exclude it specifically for Law. Email them with the exact titles of your 3 qualifications and ask - before you apply.
Regardless of this, until you have your grade predictions, you can't pick 5 realistic choices. These choices might be realistic for AAA prediction, but not for AAB or ABB. And at this stage, you need to be planning Open Days, looking around Unis, and doing some careful thinking about the 'sort of Uni' where you will feel happiest, not picking actual choices.