As there are very less colleges in india which has a B arch branch in it as it deals with perfect planning should have to be drawn so the perfect people are very less in india so there will be only about 20to 25000seats available in all over india , it doesn't mean that it is a not a good course , it is a very good course but the level of difficulty is also very much more so no one chooses this branch  branch  , but iam not discraging you I am just intimating you that how hard should you study  , hope that you will get a seat in it and all the best for your future