Shall I use
I will endeavor to be a good example for XYS graduates/graduate?
Which one should I use?
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Assuming you are referring to setting a good example for those people who have graduated from XYS university, you would say:
I will endeavor to be a good example for XYS graduates.
If you mean you will be a good example of a person who graduated from XYS (an "alumnus" or "alumna"), then you would write:
I will endeavor to be a good example of an XYS graduate.
The difference here is, are you referring to yourself as a graduate (use the singular); or are you referring to the pool of graduates as the object themselves (then use the plural).
As a side note, more commonly you might use "set a good example" in the first sentence ("I will set a good example for XYS graduates"), and in the second sentence, "I will endeavor to set a good example as an XYS graduate".