Well the Teacher does not respond to your e-mail inquires. If he did, then you would be able to ask questions and get answers.
So that would irk me, too.
And he is not responding within 24 hours per procedures.
2) You NEED to, ask or find out from the 'Grade Level Chair' HOW school work is graded. There has to be a "criteria" about grading and how it is derived, PER school curriculum. So find that out. Because, per some schools or how their curriculum is, they MAY use "formative" and/or "Summative" grading, to then derive a student's FINAL grade. And per the Common Core Standards etc. and how your Dept. of Education says how grades are derived. It is not capricious. It should not be, capricious grading. And as far as my daughter's school, (middle school), grades are NOT "averaged" like it was when I was a kid. Grades are derived, by "summative" grades ONLY. ie: Summative grades are scores that the student got on Tests. NOT on daily homework or quizzes. THUS, find out from your kid's school, HOW GRADES ARE DERIVED.
3) And common sense is, IF a kid is out sick, they are not present. Hence, how CAN a Teacher, even derive a "grade" for "participation?"
However, per my State's Dept. of Education, any absence... even if there is a Doctor's Note, that absence is marked as "unexcused." However, per my kids' schools, if a kid is absent, the student's absence is not held against them and they DO HAVE THE OPPORTUNITY, to make up any missed in-class work and any homework for the days the student was absent. So again... ASK the school, what their policies are on this.
When/if a kid is absent, it is the student's and parent's responsibility, to then GET their kid's missed school work and to get, their kid's homework from school, to bring home so the kid can do it, even if they are home sick. If possible.
4) Your daughter's Teacher... has an attitude that is irking yourself and the other parents. His approach to things, are "negative." However, there will always be Teachers, that are noxious. But if there is a bona fide wrongness, to how the Teacher is teaching and if it is preferential or discriminatory or "unfair" then you, DOCUMENT it, put it in a letter, send it to the Principal etc. and seek an explanation or clarification on things.
And have proof on your end... that your daughter is doing the work, and doing it on par, etc.
5) If your daughter is having trouble in her class or classes, then maybe get her a Tutor, or does the school have study halls or times in which the Teacher themselves, has certain periods in which they help the students? My daughter's middle school has that. So ask your daughter's school about that, too.
6) also, sometimes, EVEN if the kid, knows the material... and you studied with your child... sometimes kids make CARELESS errors on their tests. And that itself, can bring their grade down, of course. A careless error is an error. So, observe your daughter, doing her work, and see if she is prone to making careless errors, despite her knowing the material. I work at a school. I see this happen. Even to the best of students.
7) See why, your daughter is not doing well in school. Each school, each grade level, has a certain curriculum to follow and each grade level teaches that. AS a grade level. And each grade level, has certain criteria that has to be met, and taught. See what that is. At my kids' school, the Teachers DO hand out, an info. sheet, per the assignment, on WHAT exactly is the criteria for the lesson/what the kid has to do to perform their assignment/and how it will be graded/and the rubric for it. For example.
Therefore, each student and parent, does have, in hand, the criteria for each assignment, and if it is graded or not, and if it is a summative or formative assignment and grade. Some teachers are good about that and dispersing that information. Some are not.
If you do make a formal complaint about the Teacher and go up the food chain, so be it. Because, you are getting no response from her Teacher. BUT also, DOCUMENT that, and keep documenting it. Because, if the Teacher becomes retaliatory toward your daughter for your "complaining"... then you have, documentation about it.
Some Teachers do not communicate. Some do. Some are asses. Some are not. So find that out.
And find out, HOW grades are derived, and per what criteria.
A Teacher, CANNOT just make things up, on how they grade or per the curriculum's criteria.
I work at a school.