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It is quite possible for reasonable requests to be reasonably refused sometimes. e.g. I reasonably ask my boss for a pay rise but he reasonably turns me down. It is a reasonable thing, to ask for music during an exam, but it may also be reasonable for them to apply a set of rules across the board because it would be difficult to supervise an exam if half the pupils have headphones in and can't hear instructions from the invigilators.
It is quite possible for reasonable requests to be reasonably refused sometimes. e.g. I reasonably ask my boss for a pay rise but he reasonably turns me down. It is a reasonable thing, to ask for music during an exam, but it may also be reasonable for them to apply a set of rules across the board because it would be difficult to supervise an exam if half the pupils have headphones in and can't hear instructions from the invigilators.