Hahaha I feel so bad for you OP, I was in your EXACT situation this past Winter quarter.
1) We had a 36 year old or so in my lab group who was from a community college taking her first university (it's a hardcore university for science) course and she sat there as if what we were doing with weights and strings was rocket science (she was worthless in the lab group). 😡
2) We had a young girl who was one of those extremely unattractive but still attempting to look cool/pretty by wearing extra tight jeans and getting a horribly fake tan girls. She was texting on her cell phone the ENTIRE class and would occasionally chime in to ask me what the answers were for the seemingly hour-long-calculations. (Again, worthless in the lab group). 😡
3) We had a young Asian guy with glasses. I figured he'd be my last hope for help haha. What did I find (of course) - he is a freakin' WEIRDO. We had a lab where we had to do collisions with cars and use meters to record graphs, etc. He ended up having the most evil/creepy grin on his face and would smash the cars into each other as hard as he could (causing them to fall on the floor frequently making the TAs and other lab groups stare at us as if we were ALL ******ed when it was only him). So basically he came with his anime backpack and destructive tendencies to only hurt us and prevent us from leaving the classroom even one minute early (while other groups sometimes left an hour or more early). (Again, worthless 😡)
So what did I do? Only thing I could do - do it all by myself and try my god**** hardest NOT to b**** out these other lab members. So, whenever they asked me for my calculated numbers I'd tell them the equation I used to find the stuff. Then they'd say oh ok but what did u get when you plugged it in? I'd hand them my calculator and tell them to check my work. If they did it, good. If not, good (because rarely I'd give em a wrong equation on purpose out of spite) haha. I got an A in the lab class and I pray that they all failed but they probably also did well due to my hard work. Result = I got an A (much harder-earned than necessary but an A is an A)