‘Access to HE Diploma (Science, Medicine, Medical Sciences, Health Sciences) with 30 Level 3 credits at Distinction in Science or Mathematics units and 15 credits at Merit or above. This must include 15 credits in Chemistry units achieved at Distinction.’
‘GCSEs All applicants are required to hold three GCSEs at grade C/4 or above including English Language and Maths (Level 2 equivalents are not accepted).’
So you are doing the access to HE in science. You will need to achieve the level specified above, including 15 credits in chem at a distinction. Apologies i cant break this down for you very well as i have little knowledge of the credit system, i hope you understand it or can ask someone on your course 🙂
For GCSEs, it just says you need a 4 in eng lang and maths which you have so you should be fine on that front.