You should try and do this as soon as possible, as you only have 20 working days from the date you receive your returned assessment and/or written feedback or receive your exam results, in which to submit your appeal.
You should note that no student can question ‘academic judgement’ (a lecturer’s expert judgement about a student’s academic performance).
This meeting with your tutor should resolve most concerns. If, as part of this process, it becomes clear that there has been a problem with marking, such as questions being missed or grades being miscalculated, these can be resolved immediately.