Thanks for sharing this update, lux.

Find a way to keep motivated, and more importantly, stay consistent with your prep! Being inconsistent with your studies can really hurt your improvement track...

With regard to number properties--there's plenty of good info about this subject, but it's scattered. Kaplan 800 has some good info, and also look at some of the resources listed in the GMAT Resource Directory, https://www.beatthegmat.com/resources.html

Timing is critical to master! Think about practicing with a timer--it really helped me during my prep.

Good luck!