hello

first, be careful with GCSEs there are many unis that do not accept resits (i know as i had to resit and applied strategically) plymouth and kings may not be the best options, however newcastle has a contextuals programme you can look into, i am not too sure abouth leeds however i know bristole requires the highest ucat.
you will need proof for being a young carer, in ucas there will be a section for info about yourself for contextuals and unis will get in touch for proof.
given your extras, i will say liverpool would be a great strategic application as they like them. do make the most use out of these extracurriculars for personal statements and interviews!
again with your a level chem, please be careful all dental schools will require you to have sat all your a levels in a single sitting (same year) as they are extremely competitive courses.
i would really advise you to get proof as a young carer asap, and research uni requirements thoroughly as GCSE and A-Level requirements are strict. many people end up being rejected for not applying strategically, with the info you have provided i think liverpool would be a great option as it will make you such a strong candidate for interview due to your extracurriculars! after receiving your ucat, please do research uni's as applying strategically is an essential part to a successful application.
goodluck with your journey
