I’m not sure about doing A-levels at the same time as an ATPL, because as Martin said that would be very nearly impossible! But there are a few colleges out there where you can do degree’s and flying at the same time. A very local one to me is Hatfield university, situated near to where DeHavilland first produced the Comet. Here you can do many degrees in subjects such as Aeronautical Engineering, and at the same time gain a PPL with some kinda flying course they do there.