Section 20 of CAT Act 1985 - Application not to be admitted unless other remedies exhausted

What is the meaning of Application not to be admitted unless other remedies exhausted? Section 20 of Administrative Tribunals Act, 1985

Section 20 : Application not to be admitted unless other remedies exhausted

(1) A Tribunal shall not ordinarily admit an application unless it is satisfied that the applicant had availed of all the remedies available to him under the relevant service rules as to redressal of grievances.

(2) For the purposes of sub-section (1), a person shall be deemed to have availed of all the remedies available to him under the relevant service rules as to redressal of grievances, -

(a) if a final order has been made by the Government or other authority or officer or other person competent to pass such order under such rules, rejecting any appeal preferred or representation made by such person in connection with the grievance; or

(b) where no final order has been made by the Government or other authority or officer or other person competent to pass such order with regard to the appeal preferred or representation made by such person, if a period of six months from the date on which such appeal was preferred or representation was made has expired.

(3) For the purposes of sub-sections (1) and (2), any remedy available to an applicant by way of submission of a memorial to the President or to the Governor of a State or to any other functionary shall not be deemed to be one of the remedies which are available unless the applicant had elected to submit such memorial.