Been there done that (Upgraded math skills for free on personal time)
1) Set specific goal (ex. Multiplication, fractions or equations)
2) Set time line (ex. Get home, start movie download, work on math goal, eat food watch movie) in that order everyday)
3) Use free not for profit web sources such as:
khanacademy(DOT)org
Mathisfun(DOT)com
Youtube math tutor videos, math tricks
Use amazons preview feature for learn math books (ex. Headfirst algebra using their index page to help set your goals)
4) Start basic move up as you master each goal (ex. khanacad has modules for random testing in each specific goal you set with video walk-through examples and hints for each question)
5) Master the basics as they are taught and learn speed math (ex. Youtube math tricks fast multiplication, fast subtraction)
6) Adjust your timeline depending on your confidence (ex. do practice tests for law enforcement, MIL, paramedic & S.A.T college)
Do the same for bio and chem very valuable for med-tech (ex. Youtube Education has 1 hour MIT open lectures on anatomy, physiology and chemistry 101 and amazon previews for anatomy 101 index to set specific goals, take notes, replay, time stamp)
7) Upgrade your spatial thinking with video games (ex. Chess, checkers, Age of empires)
8) Write and pass an entry math test into college if available (ex. Call college ask for testing center book an appointment for math test pay $40) a few days before your CFAT for a confidence boost
You want this that's why you posted, you are clearly motivated towards upgrading your life good luck.