U should save the kitten first 
because there are many exam , but only 1 live.
you save it and u should go to school and tell that i have saved a kittens life so iam late . if the teachers are kind the y will allow u  

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I would help the kitten by talking it with me to the school because in our school we are having a first aid kit and good helper sto help that cat. I would hand it over to one the school's teachers so that she can take it and help the kitten and get done the first aid to it and from there I would rush to the exam hall and attend the exam.
note : " I would handle the situation in this way others may handle in some other way "

hope so my answer is useful and mark as best if possible..........^_^