I get a lot of anxiety presenting in front of class, how can i overcome this?

Well before you : Present, work on your breathing. Breath in slowly & deeply through your nostrils. Fill your lungs with air (but not to the point of discomfort). Hold for a count of five then slowly begin to exhale through an open mouth. Repeat at least 12 times, longer if you need to. Visualizing yourself doing the presentation before hand can help. Practice it a # of times, including in front of someone.