When I was doing the test at around 10 questions that I left to the end to stew over, I thought all I want to do is just pass even though I hate just scraping through and scraped it I did
Would have to agree, even though I sat them back in 2011, sounds like not much has changed. The ATPL AFT notes for Systems would have to be the weakest out of all of them, and as a result I only just scraped through on that exam too where the AFT study material for the rest saw me get excellent marks.
If you are going to use them (self study), try and supplement with more study references other than AFT. Not that they are bad, but yeah, paying a premium you would expect not having to purchase anything else.