I Just answered one question in AUG17 long challenge and got AC for all subtasks. But my score does not seem to get updated and it is still present in my to do list . What should I do? 
Wait for a few minutes.
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This. Seriously. You need to wait for a few minutes for ranklist to refresh/update 
I’m no expert regarding the codechefs infrastructure, but from my experience it takes some time, at least in long challenges.It shouldn’t be a problem there as there is no time-sensitive competition.
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Ranklist got updated but problem is still present in todo list 
Your score and the accuracy stuff gets updated according to the timer just above the problem section(below the picture)!
Hope I am clear!