Hello Tejaswini,

With a general rank of 18940 you might get following colleges:

• Indian Institute of Engineering Science and Technology, Shibpur
• Maulana Azad National Institute of Technology Bhopal
• National Institute of Technology Meghalaya
• National Institute of Technology, Silchar
• National Institute of Technology Hamirpur
• Indian Institute of Information Technology Srirangam, Tiruchirappalli
• Birla Institute of Technology, Mesra, Ranchi
• National Institute of Technology Agartala
• National Institute of Technology Karnataka, Surathkal
• Indian Institute of Engineering Science and Technology, Shibpur
• National Institute of Technology, Rourkela
• National Institute of Technology Patna
• Sardar Vallabhbhai National Institute of Technology, Surat
• National Institute of Technology, Andhra Pradesh
• National Institute of Technology, Kurukshetra

You can get mechanical engineering branch in following colleges:

• National Institute of Technology Hamirpur
• Punjab Engineering College, Chandigarh
• National Institute of Technology, Silchar
• National Institute of Technology Patna
• Indian Institute of Engineering Science and Technology, Shibpur
• National Institute of Technology Puducherry
• Birla Institute of Technology, Mesra, Ranchi
• National Institute of Technology, Uttarakhand
• Institute of Technology, Nirma University
• National Institute of Technology, Andhra Pradesh

Find out more information on what colleges and branches you can get with your JEE mains rank, visit the following link:

https://engineering.careers360.com/jee-main-college-predictor

All the best.