no one has ever found a shortcut to the success, its not easy for one to get a title of CA and thus it does needs a price to be paid, work on your week points and make sure you cover it up with up witht the strong aspect of yours. since the syllabus ain't going to change for individuals so one needs to work hard. 

If you are less interested in numericals and want to become ca at the same time,then you should try to practice numericals to gain interest and confidence in it as CA includes or you can say is very much dependent on numerical skills ,so,for becoming CA you will have to make your weakness your strength.
         But if you want to choose a course which contains theory more then you can choose law or cs,etc as your career as these courses are very much theoretical.
Best of luck!!