Raising Magic Skill is exactly the same as rasing Sword Skill cabal alz, Upgrade skill however is slightly different. Upgrade skills only rank up when youve ranked up your Sword or Magic skills so if you had Master in Sword skill you would have Master in Upgrade - if you then got A.Master in magic you would then have A.Master in Upgrade. Always remember to purchase your Upgrade skills as they can make you character better and can add stuff like HP every time your skills hit a new rank.
To upgrade or remove your skills simply just click on the skill icon + to level it up - to remove a level.
(if at level 1 - will remove the skill)
The higher ranked level skills you deduct a level from, the higher the cost in Alz.
You can also buy or make equipment called 'Adept' which makes levelling up your skill faster, the more skill points on the item the faster it will take to level so try to get a full decent adept set.
Practice your combos:
Combo's can seem very tricky at first, once you've managed to perfect it though you can always make it so you at least get an 11 hit combo.
Firstly you want to get your combo bar in the right place, theres 2 places you can have it either just above your character or at the very top of the screen. To change its position go into your options, choose the 'Game' tab and tick / untick 'Combo UI on top', personally i prefer it unticked.
Now the combo bar is where u want it, its time to start practicing using it. Combo Mode uses 10% of your SP bar so make sure you have enough SP before starting (the yellow bar underneath your blue magic bar which goes up by attacking enemies/dummies or dancing).
You can only use magic or sword skills when doing combo's, normal attack will not work. As I'm sure you are aware, every time you use a sword or magic skill attack you have to wait a short amount of time before you can use it again (cool down time) so when comboing make sure you are not using a move thats hasn't cooled down yet, if you do it will cancel the combo cabal alz.