When you get to level (Cabal Alz) 40, get as much adept gear as you can (including jewelry) according to your class. After that, there are three fast ways to do skill grind.
First is for training sword only and getting it up fast, you can get impact stab in Cabal, and use only that (no auto attack) while you quest and grind as usual. It allows you to (slowly) continue to progress, and levels up sword quickly.
Second is for training magic only and getting it up fast, you need 3 of the Novice magic arrows (does not matter which ones, preferably with the least attack). Then, you find a mob that you can at least do 11 combos on before it dies and combo the three arrows repeatedly. This is very fast, and a good way to practice getting 20+ combos).
Last is to simply unequal your weapon and punch mobs that are yellow/orange to you (and do least amount of damage to you). You still need to be in your adept gear, and punching will allow you to level (Cabal Online Alz) both your sword AND your magic skills at the same time. (While gaining virtually no exp) Or buy premium, and use the training dummies up to 30% of your skill points.