Sry for inconvenience mam, can i get details of collage which opt b.arch ..in Tamilnadu 

It is no inconvenience at all, we are here to help you. Here are some of the colleges which offer B.Arch in Tamilnadu:National Institute of Technology, Tiruchirappalli Vellore Institute of Technology, VelloreSRM Institute of Science and Technology, ChennaiThiagarajar College of Engineering, MaduraiBS Abdur Rahman University, ChennaiSathyabama Institute of Science and Technology, ChennaiKalasalingam Academy of Research and Education, VirudhunagarExcel College of Architecture and Planning, NamakkalMGR Educational and Research Institute, ChennaiSVS School of Architecture, CoimbatoreYou can also visit the following link for a more comprehensive list:https://engineering.careers360.com/colleges/list-of-b-arch-colleges-in-tamil-nadu