There's no getting away from it-it is quite a lot.
How are you finding your instructor? Would it be helpful to have them sit in on a test with you, so that if you do fail it, they can see exactly where you're going wrong? I know there's a fail sheet, but presumably, your instructor is putting you forward for your test because they feel you're capable of passing.
So, if that is the case, something is happening on the tests that is making you fail. It might be a good idea to have your instructor with you on test just to see.
If you think your instructor is not that good, it might be worthwhile going to another instructor and having an assessment lesson with them. Be honest about your situation, and ask them to thoroughly analyse how you drive.
I think there's some tendency to think if you've been having lessons for x amount of time, then you absolutely need to be taking your test. Personally, I disagree with this opinion. You should only take your test if you are capable of passing it, and a safe and competent driver. And the time taken to get to that point varies from person to person.