Dipendra I am sorry to say that with 62% in the 12th board examination from Rajasthan board you will be disqualified from JEE Mains exam despite of getting a score of 75 marks because in order to sit in the JEE Mains exam you need minimum 75% in 12th board and you were allowed to sit in the JEE Mains exam because your 12th board exam result was not declared but now as the result has been declared so you will be disqualified and you will not be allowed to sit in the JoSAA counseling.

One thing you can check that if in the Rajasthan board despite getting 62% you are in the top 20 percentile among the students who gave Rajasthan board exam then there will be no problem and you can look for further counselling to get admission in a college. Otherwise not only this year but you will never be allowed to sit in JEE Mains exam until you give improvement exam next year and get more than 75%.

Feel free to ask if you have any more queries. All the best!!