Not worth even $3
All the information in this app is available online for free. Linked information in the “lectures” goes nowhere. Some formulas are in raw html or maybe latex. The one star is for the arrangement of the material. Nice looking app with attractive icons. That appears to be where the development effort was exerted. Skip this one. Buy a small coffee, load up that famous video tutorial site and spend your time there.
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Does not work!!!!
Do not waste your money!!!!!!!!
