Bangalore’s more recognised German language school, Goethe-Institut offers German courses for beginners and amateurs. They have intensive and super intensive courses, varying by the frequency of classes and the levels of difficulty. Super intensive courses go to levels to familiarise you with the language. They even prep you for German exams and you can even do a course in teaching the language! Courses start at INR 17,500 depending on the level and the type of course. There are even online courses for them busy folks.
Go-eth to their website here, for registration.