This is not a valid reason for skipping the fast for that day. Ask permission to have a small snack, if possible. If they don’t allow you, this will not affect your mental ability and Allah will strengthen you!

I have an exam from 1:30pm to 9pm. The exam center will allow me to drink water to break my fast but I’m worried whether I will be mentally capable of giving an exam while fasting for so long, about 18 hrs as I will only be able to eat after 9pm. Can I miss my fast for that day?

Fasting | July 8, 2014 1:23 pm
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I have a hair loss problem for which the docter gave me a tonic medicine to be applied every night and it has alcohol content along with other natural ingredients. The percentage of alcohol is un-known. I apply it in night when I am not fasting, and wash it in the day while I am fasting. Is this ok?