Chances to pass is lower?
Maybe you should rephrase and say chances to get prize lower, but pass is easy, if you STUDY
Many people say that because they don't work hard enough

Sunway has too many students taking ACCA and the passrate is always higher than world pass rate.

take,(A) 10 people go for exam and 8 pass, or (B).1000 people go for exam and 600 pass. How objective is your judgement? you want a high relative measure, go for (A), 80%
However (B), eventhough its 60% pass rate, but the absolute number of students passed is 750%higher
Just like the arguments for ROI and RI