I would use pour réviser in both cases, but remove the last pour and optionally replace it that way:
Ce livre me sert beaucoup pour réviser mon examen.
Ce livre sert beaucoup à Alain pour réviser son examen.
There can be a slight nuance between both expressions:
Me servir à = is appropriate for me to do something.
Me servir pour = is used by me to do something.
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