Roast BBQ

Hi everyone, I am currently an undergraduate with 2.81 uGPA in computer engineering at top school (top 5). Coming here as a junior transfer, many things happened and I have to battle major depression and anxiety up till now. I'm planning to work for 1 - 2 years first before going back to grad school (need time to recover from my mental illness first). I'm very interested in pursuing either MBA or similar field to my undergrad major and I'm planning to apply to Stanford, CMU, and Berkeley. Does anyone have any idea what my chances are? I know it'll be very low, but I just need some advice on how to make my application stronger. Should I take a couple grad courses at those university and (hopefully) get an A to prove that I'm capable of doing the program?