Congratulations for your rank!!
You'll definitely get civil engineering in gcet.
You've a good and rank. And in GCET seats are very few.
But as you have a good rank your chances if getting civil engineering is quite good.
So hope for the best.
Here's a college predictor link for your further analysis.
College Predictor 2020 - Predict Colleges for Engineering, Medical, Law and More
College Predictor – Know your Admission Chances Based on Your Rank/Percentile, Home State, Caste, Gender, Exam Result in Engineering, Medica ...