How to practice skills before applying to job?

I finished my NREMT ~6 months after my class. Yes I know I was dumb for waiting that long, go ahead and roast me. It took me a while because of other college classes and me procrastinating.

Anyways, I feel like I need to brush up on all of my skills. Do you guys have any advice for relearning skills fast? What skills will IFT employers test in interviews? Will they care that it’s been 6 months since my class?