Google Classroom isn't a gradebook. Not even close. And that's okay.

Truly. Google Classroom does many tasks and makes life easier, but it's not everything. 

If you don't want to use Google Classroom with the point system that's lined up on the drop-down menu on the assignment, you can certainly key in the points you want to make possible. 

Using the points in Classroom is nice way for students to instantly see their comprehension of the material based on the score you give them when you Return work from the assignment folder. 

However, if you find the point system in Classroom arbitrary and redundant as you have to put the grade in Synergy as well, Alice Keeler has an idea for that. Thanks Alice! 

She marks the assignment with a 1 if she's read it, telling the students ahead of time that 1 means I've looked at it an you can find your actual grade in Synergy (students receive email notification through Classroom when a teacher Returns their work). If the assignment is still marked at 0, the teacher hasn't reviewed the work yet, the student hasn't gotten notification, so don't bother checking Synergy yet. 

http://www.alicekeeler.com/teachertech/2014/09/13/google-classroom-grading-with-zero-or-one/