I missed my maths zc3 exam. Fortunately they deferred it for me and now I am writing the exam in june. But the thing I am worried about is whether this will effect my free choice that I got before entering engineering one. Some where in the letter it says that it is eligible only for those students who clear the coarse in first attempt that is without any F grade. I am worried. PLease help and let me know if anyone had the same problem. Thanx in advance

I doubt anyone is going to be able to answer that question definitively as it's so specific, just call up an academic advisor and ask them, they should be able to tell you exactly what you need to know.

http://www.eng.mcmaster.ca/current/advising.html

My guess is that you won't have any problem since you haven't failed any course at all, a deferred exam makes no differences to your final grade, you're just getting the grade later than everyone else. You've still cleared the course on your first attempt (if you pass).