Confused with Technical studies/ Needing advice

[patrickgester]

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 "

[pianistavt]

You don't have to learn all the Czerny op 599 studies, pick ones that present new challenges.
Most students move on to Czerny op 299 afterward, "The School of Velocity".
You should try to reach the tempos indicated, working out the finger/hand/wrist/forearm techniques that will get you there.  You don't mention a teacher - if you don't have one, find one who teaches Czerny.
You should also be playing scales, arpeggios and octave scales, for technique.

You could post videos of your playing in Auditions, people will give you feedback.