Hi, since your son have secured 75800 rank in his JEE mains exam so based on that following are some of the best engineering colleges under the mentioned rank range;

• Guru Tegh Bahadur Institute of Technology, Delhi
• Chandigarh College of Engineering and Technology, Chandigarh
• Pondicherry Engineering College, Pondicherry
• Gurukul Kangri Vishwavidyalaya, Haridwar
• NIT, Nagaland
• Central University of Rajasthan, Ajmer
• Thaper Institute of Engineering and Technology, Patiala
• BIT, Mesra

Etc.

For more colleges you can take help of below mentioned link;

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Thank You.