I don't own a 902/903, so cannot comment. I can tell you that it is not easy reading pdfs on the IQ701 and I would not even try with medical text.
I find any kind of technical reading (especially pdfs) is best done on a computer. My siblings are in the medical profession and they have tablets.
If it is in your budget, I would get a tablet and bluebeam pdf revu (an excellent pdf annotator) so you can highlight and annotate your textbooks.
Cheers
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