I have used study guides from
http://www.kb6nu.com/study-guides/ and
https://hamstudy.org/
There are other study sites and apps out there so if either of those two above don't work for you look around and find one that does.
On hamstudy create a log in so it keeps track or your progress and where you need help, it has study questions, flash cards, and practice test.
The closest test session to you is in Norman by the South Canadian Amateur Radio Society at the Norman Fire Station 7 (2207 Goddard Ave). It is the 1st Thursday of each month and you can pre-register at
www.w5nor.org/license/index or contact
n5uwy@arrl.net if you need more info.
The test is typically $15 and you will need a pencil (or pen), a copy of your driver's license, and you may bring an old school analog calculator if you need it.
FRS will work fine as long as everyone else is using it too. It may be advantageous to buy a half dozen radios to pass out.