Okay so now as a mage you get a bonus on the intelligence stat. Meaning +1 to all stats under intelligence.
This means that the stats for intelligence are. = 
Intelligence
-Light Magic - 5+1=6
-Dark Magic - 0+1=1
-Knowledge - 5+1=6
-Perception - 5+1=6

Now as you can not have more than 5 on a skill I would suggest moving the 3 points you have from the skills that are now 6 to put into other stats.
May I suggest into the dark magic stat.