I want to answer this question from several aspects.
1. Is this teacher an old teacher?
That is, over 50 years old. The old teachers here don't have to speak Mandarin. For young teachers, except for Chinese, Putonghua is a second-class B. In other words, most teachers have a special standard of Mandarin. If the teacher you ask is an old teacher, try to get used to his way of speaking. After all, local students can understand in dialect. I really don't understand. You can find the school principal to change shifts.
2. Does nonstandard Mandarin affect normal learning?
If you can understand it, it will not affect your normal study, and you can forgive it completely. Teachers can also be advised to practice Mandarin.
The math teacher doesn't assign homework.
According to the regulations, there is no homework in the first and second grades of primary school. There is no homework for more than an hour in the senior class. Of course, some teachers think that students can be taught well without homework. Also, teachers assign homework, and students often don't write it?
The math teacher's teaching level is very poor.
This depends on whether the teacher can explain the textbook knowledge thoroughly. Primary schools do not allow teachers to expand, do not allow students to do super-outline questions, and do not increase the burden on children. If the teacher can't understand the textbook knowledge, so can most students. Under the condition that students listen carefully. Then let's see if the usual exam results can make most students pass or be excellent.
Personal advice, or ask other children if they understand. If everyone else can understand, only you can't understand, then find the reason from yourself and see if you are listening attentively and thinking about some messy things in class. In short, there are only two possibilities, your own reasons or the teacher's reasons. If, you have no problem, talk to the school leaders and, to put it mildly, transfer to a new class. If you can't transfer to another class, then teach yourself!