Take the time to draw 100 of each magic from every monster you fight. You'll find Jelleyes on the centra continent, you may be able to draw Firaga, Blizzaga and Thundaga from them. If not, you can draw Fira, Blizzara and thundara from them, which you can turn to Firaga, Bizzaga and thundaga if you have high-mag ability (10 Fira's can be refined into 1 Firaga, and so on).

Go back to the Timber and Galbadia areas, and draw 100 of confusion, sleep and blind.

Just draw, draw, draw until you have 100 of each and then junction them to your stats.

As well, refine items and cards like a son-of-a-%#$@* to get your high level magic.