I hope some of the other NCSNs will jump in and contribute to this conversation.
Interesting observation, I looked at the practice test and noticed only 2 questions on medications (they are both within the first 10 questions).
Remember that medications that are administered in school are generally medications that are necessary for a student to be in school. I have worked at all levels and have not found that the medications administered in school are all that different from level to level. You may find that some medication questions are less related to meds that are given in school, but more related to a specific condition such as Diabetes or seizures, you may not necessarily give the meds in school, but it is important to know about the meds related to side effects, expected actions, the consequence of missing a dose. Of course emergency medications given in school are important to be familiar with.
One of the most important things to remember when preparing for the exam is that it does encompass all age groups preK-12. It is important to be familiar with prek, elementary, middle and high school. The exam is global and you will or may find questions related to all age groups. If you are very familiar with one particular level, in your case elementary make sure that you prepare to answer questions related to other age groups.
Please let the list know what you think about the resource you ordered. I have discovered that with the Kindle editions of the resources you can get samples for free for some of them. I have not had a chance to look at all the samples I downloaded but the ones I have looked at have basically dealt with general nursing information, there was not really anything related to school nursing so far. I will continue to look at these as time permits.