Candidate who have secured a particular percentile in JEE mains will be qualified for JEE advanced. This year in PWD category, 0.0031029 is the minimum qualifying percentile for JEE advanced.

The minimum aggregate marks required in JEE Advanced 2019 for PWDs to get admission in IITs was 17.5. The minimum marks required in each subject was 5. For a general PWD candidate to get a rank around 100, he/she needs to score between 50-60 marks. So to be on a safe side you must get marks around 60 in JEE advance if you aim such a rank.

Since you have 68 marks you are in same zone and you have pretty good chances for getting IIT. Persons with Disability (PwD)- 5% seats (horizontally) are reserved in each of the following categories: OPEN i.e. GENERAL. GEN-EWS. OBC-NCL. The cutoff marks for General PWD candidates is half of the cutoff for General candidates.

You can check the cutoff in JEE advanced in the article given below https://engineering-careers360-com.cdn.ampproject.org/v/s/engineering.careers360.com/articles/jee-advanced-cutoff/amp?usqp=mq331AQKKAFQArABIIACAw%3D%3D&amp_js_v=a9&amp_gsa=1#referrer=https%3A%2F%2Fwww.google.com&csi=0&ampshare=https%3A%2F%2Fengineering.careers360.com%2Farticles%2Fjee-advanced-cutoff