ok so I am a fire wizard level 22 have not spent any of my trainer points yet I want my sec school to be life so this is my question can my sec school still be life if I spend 5 points for tower shield
Yes, but it might take you a while longer to get all of the life spells. You will eventually get enough training points to master a school plus some so don't worry too much and just get what you want!
If you do all the zeke quests and all othe training point quests you'll have plenty as long as you watch what you spend them on. I'm level 110 only got the cards I really needed and now have like 16 training points left over. I'm also fire/ ice to tower and life to satyr.
