Hello Manisha Naik. Thanks for contacting Careers360. 

I am very much confused by your tags and your question. You ask how to get admission into an architecture college by writing GCET, which is an engineering entrance exam.

For gaining admissions into any architecture college, you can write either JEE Mains Paper 2 or NATA. First, please check what exam the college requires you to write before taking admission into it.

And then, you have specified College of Engineering, Trivandrum in your tags. Obviously, GCET is for taking admissions into universities in Goa and Trivandrum is not in Goa. 

Hope this helps you and all the best!