Have you had a look at similar careers like a dental hygienist or dental nurse? Or other careers like an optician, podiatrist, or radiographer? I don’t know what the entry requirements for these are, and they will likely be higher than what you currently have, but may be more accepting of resits. Look at unis like QMU, Glasgow Caledonian, RGU, UWS etc. they do a lot of the vocational courses and might have less strict entry requirements. You could also look at doing an HNC or HND with the view of going to one of those unis after. Speak to your teachers, you will certainly not be the first or last person they have taught who’s been in your position, so they should be able to advise you on what your next steps might be.