I’ll take the counterpoint to Walter’s “memorize a question pool” stance.
If you’re the kind that can self-motivate to study, then I’d highly recommend the ARRL’s Ham Radio License Manual. The Kindle edition is $20, with the printed version coming in at $30.
This manual explains the background of the Amateur Radio Service, ARRL, and general operating procedures. You’ll understand the whys and hows of being a radio amateur, and a better operator when you get that ticket.
Once you’ve studied that, then you can use the free online tests to make sure you know the material well enough to take the test.
If we had 5-6 people interested, I’d consider leading a study class.