Group Discussions

I’m resitting level 2 exam but want to better understand material to increase my chances of passing. One way i have been advised to do that is through group discussions. What is your take on group discussions and how as a group can CFA candidates help each other through discussions? I think the challenges to effectively benefit are if members are full time employees and when members are not studying the material in sync like when one was in college or high school. Do members discuss topic by topic or do they all list topics that were difficult per subject then discuss them progressively? Has anyone used study groups to great effect and benefited from them? What is the mode of operation?