How do I get a 1% bonus?

You can request for bonus for certain activity you perform. Often this activities will improve the course related understanding of you as well as your fellow group members. Review the bonus policy for more information.

Can I get bonus points for finding a typo and/or grammatical error?

Unfortunately no. The are extra-credit points if and only if the typo changes the meaning of the question making it confusing for the rest of the students.