Exclusions. This section is not intended to apply to part-time schools which are conducted as an adjunct or supplement to the religious activities of a church, religious organization or place of worship, such as but not limited to Sunday schools, nursery schools, catechism or Hebrew schools, adult education or the like, or as an adjunct or supplement to the activities or programs of chartered membership organizations, but is intended to apply to educational institutions, whether or not operated in conjunction with religious organizations, churches or places of worship or chartered membership organizations which are operated on a full-time basis, which offer general academic instruction or training in a skill, trade or vocation and which are intended to fulfill state-mandated educational requirements.