Alright I didn't realise there are rules restricting that lol. So overall, would you recommend doing preparation there?
Yes. The most important aspect they can help in is getting used to the questions (involving refreshing your memory on how to solve certain math problems and reading paragraphs quickly). You also might find a couple of tricks on how to solve some questions quickly. However, don't expect a huge difference in your knowledge or ability but I strongly believe that even that small edge can help you in getting into med school, especially if time and money isn't an issue.