WalaikumSalam chameli

Dont call that disable. you are eligible to appear in CSS.

Following lines were clearly written in CSS 2011 Admission form:

Note :- Disabled candidates in the categories of physically impaired, hearing/speech impaired (deaf & dumb) and visually
impaired are allowed to indicate their preference against the four occupational groups/services only viz; (a) Commerce &
Trade Group, (b) Pakistan Audit & Accounts Service (c) Information Group and (d) Postal Group. Disabled candidates
securing a position against prescribed 7.5% merit quota on all Pakistan basis may be considered for allocation to
Foreign Service of Pakistan on the basis of his/her choice.