Capgemini Degree Apprenticeship 2023, Help!!

Hi, 

I’m in year 13 and I’m studying for my Alevels. Yesterday I applied to a Degree Apprenticeship (most likely the last one I’ll be able to apply for). I’ve submitted my application form and I’m waiting to hear back. 

If I am successful to the next stage which is a digital interview, 
What should I do then prepare? 
How should I structure my answers?
What do I do to make sure I’m confident? 

Any advice would be greatly appreciated. Thank you.