AGK was only Electrics bit hard , but further quiet doable.
POF is a hard one, but somehow Performance is scored much better.
GNAV is what Paco said. Drawing diagrams. Its very easy and quick. I did not calculate any of the Polarstereographic questions. Lambert, mercator thing also not. Just drawing it. Because pure calculating takes WAY to much time.
I also started first with those W/V questions , cross wind calculations. Thats already almost half of all the questions.
At the end I still had left very much time and scored above 90.
MET is also not hard. Read and understand it, and logical thinking. But also visualizing coriolis for example.
What happends with wind during day. Clockwise , counterclockwise etc. N S Hemisphere. Trade winds.
Airlaw / OPS etc. Those are just putting a lot of facts in your head. And make tricks for yourself to remember those facts. Nothing to understand about.
Good Luck.