best app for doing exercises assigned by coach?

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dcb1970
My son is 6 and has started getting lessons. He had been getting worksheets with positions on them -right now 48 configurations of pawn endgames. I've been entering them one by one into Tchess pro which is pretty good, but was wondering if there were better apps to use? Ideally I could store each configuration in a custom group describing the type of exercise, and also flag some for a return visit.

Thanks for any advice.