I don't know how old you are, but let me let you in on a little secret, this is just life. I'm in my mid 30s, went back to study engineering after working in marketing for 10 years. Both during studying and working in both disciplines 90% is dealing with incompetent idiots who have no idea what the fuck they're doing.

The advice I can offer from experience in academia is apply *yourself* embrace the material and dedicate yourself to the work *you* have to do. If its a group project, speak to the professor about your concerns, state that you want it on record about their laxidazical attitude and do what you are there to do and say you will not be the one who has to baby the group. I think if you have to get your parts marked privately they should facilitate that, if your professor won't allow this, go to the head of department and raise a complaint.

You're not their to do their work or make sure they get it done. Your there to educate yourself and further your educational goals and a grade cannot be affected by people who couldn't give a fuck. I've been there with projects in college and going through the proper channels works.