are these sentences correct?

[happys82]

From the first week of school is opened, students are given homework according to that week’s studies.Keeping track of student homework can be daunting with all the other tracking items such as assignments, attendance, and projects and their quantity is chosen by each subject teacher.
A single assignment paper is given by combining all teachers’ assignments.

[emsr2d2]

From the first week of school is opened, students are given homework according to that week’s studies. From the first week of school, students are given homework based on that week's studies.

Keeping track of student homework can be daunting with all the other tracking items such as assignments, attendance, and projects and their quantity is chosen by each subject teacher.
Keeping track of students' homework can be daunting, given the amount of other things that have to be tracked, such as assignments, attendance and projects. The amount of homework given is decided by each teacher.

A single assignment paper is given by combining all teachers’ assignments.
A single [assignment] paper is devised/produced/given, combining the assignments of all the teachers.

See above.

[happys82]

Thanks a lot