Just my suggestion. How about incorporating Cricket in Studies. For eg , if there are 6 participants , divide then into 2 teams A and B and members A1,A2,A3 and B1, B2 and B3respectively.
One will choose to bat and other will choose to bowl. Let team A bat and team B bowl. There are 20 overs in a match. 20 overs i meant 20 days. Every single day is 1 over in a match.
Total runs scored by the batsman = ( Total number of study hours of A1,A2,A3 ) - 0.5 * ( Total no. of study hours by B1 , B2 and B3 ). Both batsman and the bowler have to study atleast 4 hours a day.
If a batsman fails to study 4 hours they will lose 1 wicket out of 10 wickets. But still the batsman who have lost the wicket can play next day too.
If the bowler fails to study 4 hours , then its a no ball. In case of no ball , the opposing team will not lose wicket the next day ( If they lose any ) and that score will also be added to the scoreboard
Decimal values less than 0.5 will be rounded off to lower number and decimal values equal and greater than 0.5 will be rounded off to upper number
Also participant who havent updated that day will will contribute 0 runs
I don’t think challenges for studying should be this complicated. I believe in simple Check in and Check out. These kind of engaging games drains the energy and time of the Challenge composer, especially when it is a study challenge when you are intented to study and you are just busy making these little games. These games works more of a diversion and you know the more you spend time on these gadgets, the more your prime concentration decrease.