Hello dear student,

According to the eligibility criteria you should obtain a  65% of marks  as you belong to reserve Category SC/ST category candidates. Only three attempts are allowed for JEE Main in continuity. So, for 2020, it is essential that the appearing candidates have passed their Class 12 exams in 2018 or 2019. While looking into the previous year cut off for ST Category  which was increased from 24 to 44 in year 2019 . So expect an increase of 20 more marks in 2020 her mains exam. So if you want to clear the cut off so I would suggest you to obtain marks above 70 to keep yourself on a safer side .I hope this helps

Thank you and best wishes