Students now have access to PowerSchool. You can check your grades and attendance very easily. If your teacher uses the Gradebook (like I do) you can see individual grades and even check if you are missing any work.
Login is done just like you are logging into a school computer.
Here is the link:
Make sure you also check to see if there are any "CUTS" that should be "EAB" (excused absence) and get a note from your parent or have your parent call the school.