Dr. Culberson Review Dr. Culberson was an amazing asset for me taking Chemistry 151 and 152 at the university of Arizona! She was always there when a question came up, and shows passion in what she does, everyday!

Phenomenal This really helped me through a really tough semester. The Key Topic videos were the best feature, and the live lectures were really helpful and important for me as well. This program might have been the difference between two letter grades in my chemistry class.

I cannot say enough about Stem Excellence! I cannot say enough about Stem Excellence Tutoring. Lori's program is top notch and alleviated so much stress for my pre-med freshman daughter. My daughter got A's both semesters in Chemistry 151 and 152. Having the group sessions really reinforced the lectures. Lori works non-stop doing many extra sessions if needed and is always there to answer additional questions. I can't say enough, this is money well spent! We are so thankful to be able to use this service again next year in Organic Chemistry!

Best tutoring experience! The tutor could not have been better for my daughter in her first year of college. He taught calculus in a way that she could understand it & she would not have passed the class with a B without his patience & dedication to teaching better than the professor.

The website was so self explanatory and… The website was so self explanatory and of course all of the resources I had were great! I couldn't have done chemistry without it!