Linar if you visit the website www.Hodstock.com that should help alot...that will lay out what each of the class masteries are and which ones your race/class can have or attain...
You can switch your percentage of how you want your xp to go to...just simply go into your inventory menu and under the character menu and then into class mastery...from there you will see it list the ones you have/or can get by switching the list with the R2 button....to change the percentage just hit the square button while in that menu...it should bring up another menu that allows you to now click which percentage you want your cms set at...you can do any percent you feel like...I know severl people that do 100% cms when collecting quest xp...but in anycase whatever you feel is up to you...Good Luck!!