In my lab it says "your student number is UVWXYZ"

and then it's like use WX.Zg of blah, etc..
but my student number is 7 digits, not 6
so my student num is like: 1xx5xx4
which digit do I omit?

What is this for...? Sounds like 1c03..

it's the chem course for eng tech, 1CH3

I've always had to ignore the first number for certain things at mac. In my case it was a 0. In yours i guess its a 1.

I'd ignore the preceeding numbers over the last numbers, because if you're in a first year course, its assumed that you're of a certain year (i.e in my year, our student numbers started with 08...). Unless your student number is less than 09....

tl;dr: ignore the 1

TY ppl
I emailed the instructor too and they said the same thing.