Every second week (obviously) there will be your two-week-exercises posted on this page.
Where? Up there under the tabs of your grade. But you probably figured that out all by yourself.
Practice makes perfect. That's at least what they say.
I don't know if practice makes perfect but it certainly helps you to improve your English skills.
You'll find exercises on certain grammar topics under the tab "Practice Your Grammar"
You'll find some games to practice your grammar if you click on the tab "Games" (surprise...)
They're fun. At least I hope so.