Piano Forum

I would like some advice about technical exercises/repertoire.
I am an early intermediate piano student, started piano as an adult 2 years ago and  I am 24 years old.
In my first year, I was juggling around with repertoire, learning pieces way too hard for my level and very few technical studies. In year 2 I got disciplined and currently, I am practicing every day for around 1h30m to 2h. Learned Burgmuller op 100 all pieces , finishing Kabalevsky op 27 and currently starting Tchaikovksy's Album for the Young . My sightreading was neglected...and now I'm working daily for 30 minutes on it.
So this was an introductory to establish somehow my level.

I found Czerny op 599 , and started learning the little "exercise, pieces" from piece no. 20. ( because the others ones i can sightread easily ) .
I kinda like how it develops my technique...so there goes my question:

How should I practice these pieces? I treat them like normal repertoire, memorise it until I can play it fluently 80-90% and then move on to the next one.
But in this book, there are 100 pieces! So many! I also purchased another book of Czerny studies, but the structure is the same. 1 page a technical study.
So how should treat these ? Also should I learn all op 599 before moving on to another set of Czerny studies? Like Op 718 " 24 Piano studies for the left hand "