Gcse re sit

I’m re sitting English language GCSE in a couple of weeks not because I failed I got a 6, however it was my worst grade and only 6 so I want to do it again because I got a 9 in the mock. Of course it will weaken my uni application having a re sit on there. Does anyone know if you can submit the original grade on uni applications instead of the re sit grade and just continue as normal??