Hey,

With 500 marks, you will get a rank between 45023-51086. You can check here

Since you are from outside Karnataka and Tamil Nadu, you are eligible for the private medical and dental seats in these states. For Karnataka, you need to register through KEA. The application form generally releases after the declaration of NEET results. You need to register as outside state student. To know more about Karnataka counselling, check here https://medicine.careers360.com/articles/karnataka-mbbs-counselling

For Tamil Nadu, you need to register through DMET, Tamil Nadu. If you have completed class 6 - 12 partially or completely from other state, you must furnish copies of parents certificates. To know more about Tamil Nadu Counselling check here https://medicine.careers360.com/articles/tamil-nadu-mbbs-counselling

Since you are from Kerala, you have chances of getting a MBBS seat in the following colleges-

• Azeezia Medical College
• Sree Gokulam Medical College
• KMCT Medical College
• Malankara Orthodox Syrian Church Medical College
• Malabar Medical College
• Sree Narayana Institute of Medical Sciences

To know more about Kerala cut off, check here https://medicine.careers360.com/articles/neet-cutoff-kerala

With that being said, cut off varies every year depending on the number of candidates appeared, number pf candidates qualified, the top NEET marks and the difficulty of the exam. To get a list of colleges in which you have a chance of getting a MBBS/BDS seat, you can use NEET College Predictor