I will get Keam rank 18000 which is the best collage for me for CSE I'm from Kannur and BACKWARD HINDU

Since you have 18000 rank in KEAM, some colleges that you can get with your category rank (backward Hindu) in Computer Science and Engineering  and Information Technology are :

• GEC Idukki (CSE & IT, Govt)
  
• GEC Mananthavady (CSE, Govt)
  
• GEC Sreekrishnapuram (IT, Govt)
  
• College of Engineering, Chengannur, Alappuzha (CSE, Govt controlled)
  
• College of Engineering, Kannur (CSE & IT, Govt controlled )
  

The Government Engineering colleges are the best option in terms of Placements, Faculty and Infrastructure. But you should learn to adjust to hostel life.