You might look at how your study group is structured. Perhaps if each of the members were responsible for a section(s) of the material. I'm not saying that the others can ignore sections that aren't their assignments, but the primary person would be the 'go to' for questions and explanations. If someone does not carry their weight with their subjects, then they need to be chastised by all the others in the group. Hopefully, they will all rise to the occasion. I do not have fond memories of grad school (Spanish language and lit) and we had some students who were the 'leeches' that drove us all crazy.

Good luck and ride when you can.

P2