I just took a UCAT practice test

Hi, I just took my first ever UCAT practice test. I'm currently in early year 12, and started the test at 10pm, finished at about 11:55pm. I got a score of 2000 but didn't have any paper to write on which some sections could've benefited from. Is that good, bad, in between? I don't really have a frame of reference. I mainly dropped my marks on the last section (I got 31/44, 26/35, 18/36, 31/69), so given time, what could I expect to get in year 13 when applying?

That's a reasonable score. Not amazing, but not bad at all, you could probably apply and get into some places with that score. It's good for a first attempt, and doing it without pen and paper is crazy difficult, so well done! Now, what you have to do, is forget about the UCAT for a little bit, because starting to prepare right now is not going to massively help you - for whatever reason when people practice too much the UCAT their performance worsens instead of getting better. It'd be a shame if that were to happen to you, so just start prepping a month or two before your actual test date. And good luck
P.S.: it's hard to say what you'll actually get but you do get a lot better and very quickly with short, consistent practice on the lead-up to the exam. But, I cannot stress enough how poor of an idea I think it is to start prepping effectively at least 9 months in advance!

go study your a levels