I see that you will likely take the German and Classics route.
Fortunately, you're not entering something as competitive as medicine, so you're fairly fortunate in that respect.
With that in mind, of course you're going to focus on GCSEs, but as someone who wants to do French and Linguistics/Classics, I've done a lot of research, and believe me, if you can get AAA, or even A*A*A as you're hoping, then, as long as you pass the interview and the different aptitude tests, then you'll be at least on the right track.
8 A* and 4 A is still very good, and as the Classics and Modern Languages route isn't EXTREMELY competitive- of course it's competitive, but not as much so as, say, Medicine or PPE- then you should be absolutely fine.
Good luck in your GCSEs!