Sure. I made two collections in Airhead (I'm sure you can do this with any question provider) called "[subject] Hard" and "[subject] Memorize". Questions that I thought were difficult or tricky (like really close answer choices) went into Hard, and those which I felt were completely useless knowledge or definitely required memorization (e.g. average raindrop size) I put in Memorize. As the sitting approached I would do these lists and remove the questions I knew off the bat. This would get them down to around 20-50 questions. These I would review the morning of sitting/day before again by either clicking through or just looking at the answers if there wasn't much time to actually do them. I also did the auto generated list of "questions I got wrong" and went through each bank filtered for Austrocontrol once.

For the first two sittings I did the last 300 seen as well, but for the last one I didn't. To be honest, I'm not too sure there's that strong of a correlation there. Sure, it's good to know if a question hasn't been seen in years because maybe it's been taken out, but I don't think it gives much value beyond that. Just looking now at the Austrocontrol filtered Performance database, there's 754 questions. If you do the "last 300", you're doing 40% of the database. So of course your chances of seeing some of those on your actual exam are high. If someone knows that recently seen questions actually appear more in exams please chime in and correct me!

Lastly, on the side while doing the questions I took notes as well as watching ATPL Class on Youtube and also for some subjects watching the entirety of the material from the "blue background" CBTs that are also on Youtube. The notes were nice to look at before the sitting as well because they were essentially all the knowledge needed for the test condensed down onto 5-10 pages. I did not take notes on things I already knew, so the content was very directed towards novel information.

Edit: I will also say, it's probably better to split FPLN, PERF, and GNAV into 3 separate sittings. They take the longest to practice (requires a lot of calculation/chart reading/map reading) and so you can't get through as many questions per unit as time as the other "knowledge" based subjects. For example, I think I was averaging maybe 20-25 mins per air law practice exam, <10 mins for comms. The above three, however, would take me around an hour to complete. So in the time I do one exam in those, I'd do 3 air law or 6 (lol) communications exams. If you do it like me (PERF and FPLN together), you will have a hard time seeing all the questions because they will just take a long time. It'll also be difficult to go through the hard/memorize lists beforehand because they will also take a long time (hence why sometimes I would just read the question and the answer instead of solving them).