Getting a good rank will help you in securing your seat in Kerala b.arch but it also depends on how well you scored in your 12th grade.so both good rank and academic record together required for admission.

a score of  more than 145 is an A+ score good for top institutions, between 130 & 145 is A grade scores good for any A grade institution. The board percentage is also added. A percentage of anything higher than 85 is good.

Hope you got selected!!