Do Universities care about Level 3 Btec? Even though I take a big A levelWatch
You are doing the required science A Level, so I don't see any reason why you shouldn't get an offer, as long as your predicted grades are high enough.
They are not automatically equal to an A level.
For some subjects BTECs are not 'academic' enough for the intended degree.
You need to check with each University - before you apply.