What is the limit of Skill Point(SP)?

[Sealbreaker]

Is it possible to get SP after lvl 150?
What will happen when I switch to 2nd class at lvl 150, will I yet get more SP after lvl 150?
And is it possible to use EP for 1st class skills?

I have Mage class and I'm interested in maxing out all ice skills and other main skills.
Total point required is 497, to max out all ice skills and other main skills(No fire skills).
Lvl 150 maybe gives max 450 Skill Points, so I need to exceed lvl150 to get all skills.