Complex sentence: The state exit exam is a written exam that usually tests student's math, reading, writing, and science skills, whereas the culminating project is a required project that is usually a learning experience based on a topic chosen by the student.
Split into simpler sentences: The state exit exam is a written exam that usually tests student's math, reading, writing, and science skills. Whereas the culminating project is a required project that is usually a learning experience based on a topic chosen by the student.