How can I get an A* in A level English Language?

I would read the top band of the mark scheme and responses given top marks

Practice, practice, practice from all available past papers and look for high scoring responses, analyse them to see how they meet the requirements outlined in the highest band in mark schemes. Equally important, read examiner reports for all past papers, they give a clear idea of what kind of responses score high or low, where candidates often go wrong, and what the highest scoring responses have in common.
I did all of the above and got an A*. Not saying it's easy, but as long as your methods are right and you spend enough hours doing the right things, you can definitely make it.
Good luck and feel free to ask any follow up questions, I'd be happy to clarify.

Practice, practice, practice from all available past papers and look for high scoring responses, analyse them to see how they meet the requirements outlined in the highest band in mark schemes. Equally important, read examiner reports for all past papers, they give a clear idea of what kind of responses score high or low, where candidates often go wrong, and what the highest scoring responses have in common.
I did all of the above and got an A*. Not saying it's easy, but as long as your methods are right and you spend enough hours doing the right things, you can definitely make it.
Good luck and feel free to ask any follow up questions, I'd be happy to clarify.

Do you think I should get a tutor and if so, do you know any?

Depends. While I don't have personal experience with tutors, from what I've heard it can be helpful. Again, depends on the tutor, the time you spend with them, the kind of support they provide, and whether you're able to act on their feedback - because in the end, remember, it'll be you taking the exam, not your tutor.
Sadly, I don't know any tutors and therefore wouldn't be able to recommend any (plus I have no idea where you're located either), but if you like, I'd be happy to provide informal advice and support on a voluntary basis. It can be a temporary way to help you learn useful subject-specific knowledge and study techniques while you look for formal tutoring.
Feel free to shoot me a message if you have specific questions. Good luck!

Which exam board are you doing? Are you doing an NEA?

AQA and yes I'm doing an NEA.

That's awesome, I'm doing the same. I'm moving into Y13, wbu? How have you found the NEA so far, I'm starting my first draft

I'm moving into y13 too. I've done my first draft for the og writing and started the language investigation

oh my God that's amazing
still on my draft lol
when do you plan on finishing it?

I think my school aims us all to finish by December but I'm not sure. What's your style model

I'm not doing the original writing, I'm doing the language investigation so I don't have a style model

That's awesome, I'm doing the same. I'm moving into Y13, wbu? How have you found the NEA so far, I'm starting my first draft

I'm not doing the original writing, I'm doing the language investigation so I don't have a style model

I think my school aims us all to finish by December but I'm not sure. What's your style model

My style model was The Garden Party by Katherine Mansfield.