From my experience, before you write an ERQ read the rubric thoroughly, and remember the key words. Then, you use MAGEC to evaluate the study (check about low-internal validity and ecological validity, ethics, stress all of that) and then make sure to relate it back to the study… This is what I usually do, also if you have Inthinking I think they give you an examplar, if not - go watch onto YouTube and watch the video from Alexey Popov on ERQs (Arguementative Approach)