I'd recommend looking into a few of the options. I know that they can be quite pricey but the UCAT ninja, which has loads of video tutorials and a MASSIVE question bank, you can get for whatever price you wish to pay - even just 1/2 pounds, which is pretty cool. I also agree with the above - practicing online is FAR better - practice those keyboard tricks!!
Hope that helps and try not to feel too de-motivated about a gap year, it is hard, but you have got this and I hope all goes well with re-applying!