Hello! Sometimes, it may be overwhelming when we realise that our workload is increasing as the semester draws to a close, since there are a lot of assignments and projects that would be due. One of the things I do that helps me to reduce my procrastination is to simply start on one part of the assignment. It may seem like a small effort, but as one of my lecturers once suggested, it can help to address the initial “inertia” you may experience in not starting the assignment at all. Even if it’s just writing the first sentence for the assignment, we may feel more motivated to continue from that sentence 
To address the point of uncooperative group mates, I think being able to address the root problem of these group mates may be helpful. I recently came across another thread on this platform where the individual shares a similar concern, maybe you can check it out! How to have cooperative group mates?
Hope these help you to ease your concerns a little, I wish you all the best!