Okay....angles associated with circles.   Remember, vertex inside add and take half, vertex outside subtract and take half, vertex on...just take half.  Here is a website with some example problems.

How about simplifying radicals?  If you need help, go here.  If you go there, make sure and check out the second page by clicking the link to "second level" down at the bottom.

Looking for help on complex numbers?  Go here.