Suggestion for Future: Accelerated Practice
For future Hindi course, have "Accelerated Practice"
Right now, to match characters (with or without diacritics), the choices are the same consonants. Perhaps two consonants at most
In next roll-out, you should have single consonant and diacritic (in Roman Letters), and for choices, you should have the same consonant with different diacritic marks.
It would be great training and make us think!