Chem

I sat for U1 chem in Jan and ended up getting a 101 UMS grade A, but I plan on retaking it since it’s a low A (I’m only a few marks away from downgrading to a B) and I’m afraid that I might not be able to preform well for U2 and compensate the marks since it’s usually the difficult paper. So what should I do?? Can I still get an overall A grade with a low UMS in U1? It’s my first time taking As edexcel in general so I’m a bit clueless 😭