I was a Ham in my teens to early 20's (forgot exactly)...
Between undergrad and grad school, travel, I let it lapse. With our two little ones really digging walkie talkies, I decided to get back into the hobby again, and did so this past fall.
I self-studied from this site.
https://hamexam.org/
I did all of my studying in airports and on airplanes actually...
Enjoy.
Tony - N6VOX