I was surprised by your behaviour. This sentence is grammatically correct.

(Active voice) The news surprised me.
In passive voice this is written as: I was surprised by the news. 

I was surprised at the news of him passing the exam is grammatically correct. How? Shouldn't we use BY?

Dear student,

The adjective surprised can take at/ by interchangeably. Thus, using 'at' or 'by', both would be correct.


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when it is saying about anything then it is at or else it is by
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The Answer :- I was surprised by the news of him passing the exam 
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