Hello Surendra.Based on your rank in CUSAT Exam you might not get Computer Science in the First Round in main campus at Ernakulam as the cut off rank is under 2500.You can get CS in the further rounds of counselling.Moreover you can easily get Information Technology,Electronics and Communication Engineering at this rank.Please go through the following link for more details.All the best.

https://engineering.careers360.com/articles/cusat-cat-cutoff