why do you think people will do the same paper you're going to do?
Don't cheat in the exam because when it comes to the real thing you will struggle you've just started so keep up with work and you will do fine in your mocks
Even if they are the same (this is so unlikely anyway), this isn't going to help you in the long run. If you have mocks in November, I'm assuming you have another set later in the year - not learning the basic content now just means it's all going to build up at the end of Year 12 when you'll have personal statements and UCAS to start dealing with.