if you use smartphone than there is a best app available which is ‘Swapn MPSC'
in this app this provides online study material & online test series for the exams - both for your Prelims as well as Mains.here you will find the articles as one of the best.
you can give FREE test here which is very usefull for preparation and you will find the standard of the question is similar to that of MPSC.so i can say this wil be one of the best study material in hand you can get.