I saw that you read PDF files and textbooks and say that you're a student, so I'm guessing that you're trying to read technical documents (with equations, tables, drawings, source code examples,...). Reflow doesn't work with those kinds of documents, as the results are incomprehensible. Fortunately, the 9.7" screen of the 903 is large enough to display most technical documents in their original layout without needing reflow, and you can use it in landscape mode to get a little bigger font size.
There was a thread in this forum about a month ago on reading scientific documents on the 902/903. Check it out for some opinions and pictures.
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