Can i lodge an administrative complaint (article 90) before receiving my review reply (on the same subject)?
No. If deemed necessary, it should be done after receipt of the review reply. The article 90 administrative complaint has to be based on a decision which negatively affects your legal status as a candidate, i.e. in this case based on the Selection Board's negative reply to a review. The deadline for submitting an article 90 complaint is within 3 months from the notification of the decision you wish to contest.