Hi arun,
Yes, they can fill the NMMS (National Means cum Merit Scholarship ) form. 15th July 2020 is the tentative date from which the state SCERTs will be releasing the form. The annual parental income should be less than Rs 1,50,000 in order to become eligible for the same.
You can also refer to the given link in order to get more information regarding the same.
https://school.careers360.com/articles/nmms-application-form

All the best !
Feel free to ask if you have any further doubts.