I'm sorry you're finding quant so annoying.
Have you been using the Foundations of Math (FoM) book? Often, when someone's struggling at that level, it's because there are holes in the foundation that are making it hard for you to work efficiently / effectively.
Open up that book (you have it right? the system is telling me you're taking a class) and just start right in with chapter 1. Test your skills using the problem sets at the end of each chapter. There are also two FoM workshops you can join - we hold them live (online) once a month or you can watch tapes of the classes.
How far are you into your course? In the past, I've recommended to students who were having similar problems that they take several weeks to work carefully through FoM before joining the course - even postponing a course they'd already joined, if necessary. I think you can switch to a different course as long as you do so within the first 3 classes. (Note: don't quote me on this - I could be wrong about the details. You'll need to talk to our Student Services team to see what's allowed.)
You can also put a course on hold and pick up again from that class later on - eg, if you just had class 5, you could "suspend" your studies and come back in a month and pick up with a different class from class 6.
What do you think? (You can contact our student services team at 800.576.GMAT or
gmat@manhattanprep.com)
If you do that, just concentrate on solidifying all of those foundations - don't worry about time, more advanced problems, etc. You'll be able to concentrate on that stuff once the foundational material comes together and you're not using so much brain energy trying to get that part of things to work.