First of all, thank you for your replies!
My weakness is the SC question type. RC works out really well and CR is probably alright.
1)
In SC, I usually come to two remaining options and then, independent from the level of the question, take the wrong one about 70% of the time. It's very frustrating, thus, I already though about just choosing the
other answer in questions where I am not 100% sure with my answer.
2)
Yes I took the entire CATs, only one was without the essay. (edit: I took them today, yesterday and around a week ago) Moreover, I did not take them in an optimal environment (open library, lots of people moving around, quiet noisy).
3)
It's already this Thursday 11 a.m. GMT +0. I will use tomorrow (Sunday) to practise Essay and especially IR again, Monday to eliminate last problems in the Quant Section and use Tuesday and Wednesday to review my typical error pattern. (I practise around 8 hours a day, not just part time)
Best
JAYEM