Good for you to try out the tutors! I'm surprised they weren't more helpful. I'm a third year chemistry major and understand that it can be challenging at times!
I try to do my homework in groups, with other students from my classes. Work through the study questions in the text as you do the reading and ask the prof if there are extra problems from the text that they recommend for practice.
If you are having a difficult time with the math, sometimes a solutions manual that accompanies your textbook is a good resource. Most of my upper division classes require them. Seeing a problem worked out step by step is the best way to
understand it, you just have to learn not to rely on it too much.
I wouldn't necessary recommend spending money on a modelling kit for a general chem class. I would download a free molecule builder, like Jmol, from the Internet if you are having difficulty visualizing molecules.
Good Luck!