The UCAT and BMAT are admission tests you do before you apply, however the BMAT no longer exists. All medical schools now do the UCAT, so you’ll be sitting the UCAT. You’ll do your UCAT in your year 12 summer between june and september, so you still have till next year. The UCAT is only valid in the year in which you’re applying to uni. Hope that made sense, good luck!