b/c = because

& = and (or any other and sign that you use or have seen, whatever is simple)

I don’t know any for that.

w/ = With

w/o = without

Though you can use whatever makes sense to you.

Also, you can look up text message abbriviations and use those as too. Sort of like

u = you

ppl = people

@ = at

and just about anything used for a text message. You can find some here: http://techdictionary.com/chat.html though I can’t imagine how you’d use some of those in short hand or in taking notes. So I did another check, and found it was rather hard to find anything that would work for what you’re loking for. So, I suggest making up your own, asking an english teacher, or taking a look around the net yourself, though the search may not be simple.

Best of luck, and hope I was of some help.