Review any number of pull requests that you want: https://github.com/pulls?page=2&q=is%3Aopen+is%3Apr+user%3Aopenmrs&user=openmrs
For the pull requests you choose, have at least five (preferably more) meaningful comments, in total.
Meaningful in the sense that they will require feedback from the pull request author.
You could review to ensure that our pull request tips are followed: https://wiki.openmrs.org/display/docs/Pull+Request+Tips
Here is the list of pull requests that are waiting for review. Reviewing other people's work is one of the great ways of learning about OpenMRS. You can even review code for some one more experienced than you. Reviews can be as simple as checking to ensure that commits are squashed into one, adherence to our code conventions, finding spelling mistakes, or pointing out missing JavaDoc comments. More details about code reviews can be found at this wiki page.
- You need to submit the pull request URL which contains your reviews.