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Titles are capitalized.

I have a math teacher thatwho is very strict because she explain us the term but she doerms to us but doesn't answer your questions appropriately, and it is very difficult to learn by yourself if you don't have someone to practice with. I have a math teacher who is very strict because she explains terms to us but doesn't answer your questions appropriately, and it is very difficult to learn by yourself if you don't have someone to practice with.

I think "strict" is an odd choice here. I'd expect that to describe a teacher who does not tolerate any mistakes. Maybe "unhelpful"?

I have a math teacher that is very strict because s. She explain us the terms to us but she doesn't answer your questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with. I have a math teacher that is very strict. She explains the terms to us but she doesn't answer our questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with.

I have a math teacher thatwho is very strict because she explain us the terms but she doesn't answer your questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with. I have a math teacher who is very strict because she explains the terms but she doesn't answer your questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with.

I think word choice for "appropriately" would be slightly different if I were to write this sentence; "she doesn't properly answer your questions" is how I would have most likely put it. Most of the other corrections are the same as the other correctors have said.

I have a math teacher thatwho is very strict because she explains to us the terms but she doesn't answer your questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with. I have a math teacher who is very strict because she explains to us the terms but she doesn't answer your questions appropriately and it is very difficult to learn by yourself if you don't have someone to practice with.

I had a better math teacher in the high school and he explain youed (things more / things to me more) than my actuallycurrent teacher. I had a better math teacher in high school and he explained (things more / things to me more) than my current teacher.

If you say "actual teacher" it means your high school math teacher is not actually a teacher.

I had a better math teacher in the high school, and he explain you more than my actuallys the concepts more thoroughly than my current teacher I had a better math teacher in high school, and he explains the concepts more thoroughly than my current teacher

It sounds more natural to me if there's an object attached to "explains" rather than just having "he explains more," or you could say "he gives more thorough explanations."

I had a better math teacher in the high school and he explain youed more than my actuallyo you than my current teacher I had a better math teacher in high school and he explained more to you than my current teacher

I had a better math teacher in the high school, and he explain you moreed (more/better) than my actuallycurrent teacher. I had a better math teacher in high school, and he explained (more/better) than my current teacher.

Using "actual" suggests the teacher in high school was not a real teacher or was never your teacher, so "current" fits better.

I had a better math teacher in the high school and he explain you more than my actually teacher.

Delete

I had a better math teacher in the high school and he explain you more than my actually teacher.

Looks like an accidental copy of the second sentence