You can either click on the PowerSchool Parent Icon on the main navigation bar above, or you can follow this link for the login screen. PowerSchool allows students and parents to check up on student grades, attendance, and assignments. Please use liberally.
This site has some excellent tips about grammar and usage. The site is a little cumbersome, but I recommend following the links on the navigation bar under the "Grammar Girl: Quick and Dirty Tips for Better Writing" banner.