Learning how to conjugate

There's nothing more tedious than remembering French conjugations!
To help your child with his grammar lessons, remind him that there are only 20 possible endings for French verbs no matter how you need to conjugate it.
Also, take your time, there's no point in trying to make him learn off by heart all in one go.
Test him regularly and use a book to help you (like Bescherelle for example).