No if you take a lot of skills because warlock/cleric is a very huge SP demanding build.
There are special tools to calculate how much SP a build needs, this one is very good:
http://nivlam.com/If you are tempted by a special build it's better to browse the guides on this forum, pick out the skills you want and make a calculation of how much SP you need. Some levels (level 20, 40, 60, 76 ...) come with a lot of new skills, other levels don't bring anything new. Those ones are the ones to play with a gap on.