mech1500 - computing 1M is the first year computing course, its only a 3 unit course but the topics are VERY hard (I seriously think it's 2nd/3rd year maths - I'm don't understand any of the theory, I just tried to remember the equations for the finals
)
You can have a peek at the lecture notes
here
Don't get intimidated, I doubt most people understand ALL of the notes (lecturer is also a bit lost...). Personally I think it's a bit of a joke subject (mid session and final session being completely multiple choice and mid session being the exact same as the previous years so like everyone got 100%)
If your going to specialise in mechatronics then you'll inevitably have to deal with computers more than the other specialisations.
You'll probably automatically improve your computing skills soon enough since a lot of courses involves use of computers.