Flamentine
Pros - Motivation for the students, fair assessment for everyone, easier for teachers to keep track/make comparisons/determine students' progress etc.
Cons - Students may be too focused on achieving high marks and ignore the learning process, sometimes it's difficult to come up with an effective marking scheme for some subjects, sense of failure for those who can't keep up.
Jadynn
You can probably find some stuff online. Just remember that material for children tend to have very basic and simple themes that run through the whole story or poem. Try not to get too complicated with anything; it should flow smoothly and be easy to follow.