Subject to subsection (b) of this section, the Board may authorize an applicant to take an examination for: a Grade 1 stationary engineer license if the individual lawfully provided stationary engineering services in the State in accordance with § 6.5–302(e) of this subtitle for 5 or more consecutive years immediately prior to the date of application; a Grade 2 stationary engineer license if the individual lawfully provided stationary engineering services in the State in accordance with § 6.5–302(d) of this subtitle for 3 or more consecutive years immediately prior to the date of application; a Grade 3 stationary engineer license if the individual lawfully provided stationary engineering services in the State in accordance with § 6.5–302(c) of this subtitle for 2 or more consecutive years immediately prior to the date of application; or a Grade 4 stationary engineer license if the individual lawfully provided stationary engineering services in the State in accordance with § 6.5–302(b) of this subtitle for 6 or more consecutive months immediately prior to the date of application. The Board may authorize an individual to take an examination under this section only if the applicant submits to the Board: an examination application on the form that the Board provides; an application fee set by the Board; proof of eligibility for the applicable application; and an application for the applicable license in accordance with the provisions of this title.