“Navigating Brexit and Citizenship: Can a Dual Citizen with British and German Passports Study in England?”

I was born and raised in Germany but am British as my mother is British. I have a British passport but I don’t think I have a certificate.

Because of Brexit I will soon get German citizenship, but I and my mother will keep British citizenship.

But I wonder if I can study in England later because I’m British. I would like to study in England because I would like to live and work there later. And I never met my relatives in England.

I heard that immigration will be difficult if Brexit goes through. But it shouldn’t really affect me because I’m British, right? (Soon I will also have German citizenship, I have dual citizenship, that has already been applied for BTW.) I know this question is worded confusingly, but I hope someone understands it.