No, 12% of 6500 is the minimum amount that you have to remit i.e 780, it means those who are getting 6500 or more than that they are required to remit 780 and for those who are getting less than 6500 it depends on 12 % of their basic + D.A + retaining allowance if any.
It does not includes
(i) the cash value of any food concession;
(ii) house-rent allowance, overtime allowance, bonus, commission or any other similar allowance payable to the employee in respect of his employment or of work done in such employment;
(iii) any presents made by the employer
i think now you are clear