Réapprendre belong to the 3rd group. Réapprendre is a common french verb.
Réapprendre is conjugated the same way that verbs that end in : -endre
Réapprendre is conjugated with auxiliary avoir.
Réapprendre verb is
direct transitive. Réapprendre verb is a direct transitive verb, so passive voice can be used.
Réapprendre is a french third group verb. So, this verb is irregular and do not follow a regular conjugation pattern like first or second group verbs. Follow this link to see all the endings of the conjugation of most of the third group verbs : conjugation rules and endings for the second group verbs.
Most verbs in -dre: -andre, -endre, -ondre, -erdre, -ordre conjugate like rendre (major exceptions are those in -indre and -oudre). Prendre and its compounds, however, have a very different conjugation, where the d is only kept in the future and conditional.