University and conditional offer?

Ok so i have a conditional offer from my university to get ABB in my grades, currently im getting AAA, but my attendace is poor, can they take my offer away or because it is an offer can they only reject me if i get my grades. I am wondering because my attendace is very poor and i want to know if this is a factor for my offer to be withdrawn. Just a note in my offer it does not say anything about attendance.