* He was a professor at Cambridge University: Newton held the Lucasian Professorship of Mathematics at Cambridge from 1669 until 1701. This was a prestigious position, and his lectures were likely attended by a variety of students at different levels.
* His lectures were advanced: His lectures covered advanced mathematical topics, including his own groundbreaking work on calculus, optics, and physics. These wouldn't be typical topics taught in a high school or even an undergraduate program today.
* He wasn't a "typical" teacher: While he lectured, Newton wasn't known for his teaching skills. He was often absentminded and not very engaging. He also focused more on his own research than on teaching.
So, while he was a professor of mathematics, he didn't teach a specific year or grade. His lectures were geared towards advanced students and covered cutting-edge mathematics that was far ahead of its time.
