Congratulations on getting such a good rank. I have many friends who cleared CUSAT and are well settled in their respective fields. Based on their reviews about the institution, I can give you some information about it a bit.
In short, 1,820 is quite a good rank for CUSAT if you are into any field except CSE and Safety & Fire. Nevertheless, if you are looking for these specific branches, you can most likely get into these at CUCEK.