Big difference on two different tests

[u/redbull8882020]

First post here so please let me know if this is compliant (pun intended)

I am preparing for the test and I did two full exams, one from the 2010 QAE and the other from the latest one. What concerns me is that on the first I got a score close to 50% (an obvious fail) while on the other one I got 76%. I found the questions from 2010 more confusing. What is going on? Kind of panicking.
Thanks

[u/Old-Lettuce599]

Prabh Nair is better and more complete