The Grammar Guide is always a good source to turn to.  Here the guide offers separate pages on use of the question mark, the period, and the exclamation point.  Easy to understand instruction. Self-quizzes are offered as well.

The Question Mark

The Period

The Exclamation Mark

These grammar exercises are provided to the public from book publisher Pearson/Longman. Good quality interface, and good sentence problems.  Try both of the multiple choice and sentence editing problems.

Using end punctuation (sentence editing)
Using end punctuation (multiple choice)

From the WriteSite at CUNY.  A good self quiz on end punctuation

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