Hey there , first of all congratulations on making the decision to join the world of STEM , you are going to love it . Especially if you are going to study mechanical engineering.
A levels is very different from university but first year is designed to help you adjust to the change. Depending on the university you attend there should be sufficient academic support if you need it.
My best advice to you would be attend all your classes or as many as you possibly can and stay on track with all your submissions. It can be a little overwhelming if you fall behind too much but other than that's first year is somewhat of a breeze. I hope this helps .
Cece
Energy Engineering Student
De Montfort University