"I've been studying in astronomy for quite some time, and quickly learned about it. I also take cosmology classes, so mathematics will be included in my classes."
This teacher is currently studying, therefore, a student may study along with the teacher. This doesn't mean that the teacher is undereducated, it means that the teacher is seeking the real answer or knowledge.
This world has a bunch of lies, which is why this teacher asks questions during or after classes, so he can know or be informed that this or that was true.
This teacher also teaches about mathematical models of celestial bodies like stars, black holes, galaxies, and many more. He will provide explanation and reason why it makes sense or is valid.
Although he's still in grade 7, he was able to teach students ranging from Grade 8-12.
This teacher was also called a "prodigy" when he was 12 years old, therefore, this young teacher has good potential for this profession.
With addition, this teacher also teaches english classes, specifically on writing, and grammer.
'Writing' specifically focuses in novels and fiction and the study of the dictionary, therefore, old english to royal english will be discussed during classes.
Lastly, this teacher is more dependant in english rather than astronomy/cosmology.