Scottish students don't do A levels, they do Highers. The required grades for Glasgow are:
Entry requirements
Typical offer
Highers: ABBB, preferably with two science subjects
A-levels: ABB, preferably with two science subjects
IB: 32 points including three science subjects
Faster route degree entry requirements
Applicants with AAA grades in appropriate Advanced Highers or A-levels, or International Baccalaureate with 6,6,5 at Higher Level in appropriate subjects and at least 38 points overall, will be considered for our Faster Route degree programmes where available.
I'm sure you are capable of looking up the required grades for the other two universities. Anyone with those grades are in with a chance of a place.