NatSci is short for "natural sciences" which refer to these two courses in UP Diliman, Nat Sci 1 and Nat Sci 2. Each Nat Sci course is by itself composed two subjects which are switched halfway through the semester.
- Nat Sci 1 - physics and chemistry
- Nat Sci 2 - earth science and biology
In the old RGEP system there used to be a Nat Sci 3 subject, which deals with the study of the Earth's chronological growth and evolution.