The best people to do this work will be someone who has just passed (or is working on) a level high than that. A high school lab report can be much better drafted by a undergrad freshmen than a grad student as he has done this recently and is much more connected with it while the grad student has elevated in terms of language and lowest common denominator of knowledge in any subject. They also tend to forget the basics somehow.
I agree completely. For this reason, there are undergraduate students, grad students, and professionals on the site.
We simply require that they attend a top 20 school at this point. This is mostly so that customers know that all editors meet that baseline measure of credibility (i.e. they made it through the same process that the applicant is pursuing, and thus probably know what it takes).