Max points is what you would have if you had all skills trained to rank 9. The server calculates this when the game starts based on the number of skills it loads from the database. I don't know what the number is offhand, since it isn't hardcoded.

It's not about the highest tier trained; having a Tier 6 skill doesn't give you Tech level 6.

Edit: I pulled this from the log during a launch:

There are 51 skills loaded
Total skill points are 1566
Points per tech level is 156

So it looks like you would need 936 pts for TL 6.