Hello,
With a Percentile of 66 in JEE mains, your rank in the common rank list would be more than 280000. With this rank you won't be able to get any seat in any government engineering colleges like NITs IIITs and GFTIs. Also in the state engineering colleges, it would be hard to get a seat.
You can go for some top private engineering colleges in India like

• Sharda University Greater Noida
• SRM Chennai
• Amity University Noida
• SIT pune
• LPU Jalandhar

For more such colleges please visit this link https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India&ved=2ahUKEwi6rsKa0tbqAhUW9XMBHdGUDHMQFjAOegQIBRAB&usg=AOvVaw3ZtyjIynwh5jLDs3nOHHoU

also you can try to improve your score in the next session of JEE mains which is going to be conducted in September 2020. You have plenty of time to practice. You can opt for the JEE mains crash course by Careers 360 which provides previous year question papers, video lessons, frequent mock tests and many more.
please visit this link
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/careers360-jee-main-crash-course/amp&ved=2ahUKEwj4_Kek09bqAhXZfX0KHfkPAZAQFjABegQIAxAB&usg=AOvVaw2qqSyBCop2N7ziMSe61Y3S&ampcf=1

hope it helps

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