Depends on a lot of factors.
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Where are you from? If you are from north India, more often than not, you will be traveling home by flight and each round trip will cost you atleast 10k and there goes your additional savings that you were talking about.
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Did you ever stay away from home, do you want to experience it? How good are you with making new friends, it is not easy to make friends after college. If you are someone who likes your own company, then fine otherwise you will end up spending much higher 30k per month, considering a single pg or a room in flat itself costs around 20k pm in areas like bellandur and HSR.
No city is a good or a bad place. There are things that are better in bangalore than in your hometown, and there are things in your hometown better than bangalore.
I'm a hyderabadi living in bangalore for about 1.5 year now. I have not once been asked to learn kannada or talk in kannada. As long as you are respectful to people around you, it really doesn't matter.
The traffic problem is real. But which city doesn't have traffic woes. Mumbai does, hyderabad does and so does bangalore.
Water crisis is also there in a lot of parts of the city. The city needs help, government needs to step and take a lot of rapid measures. But as long as you find an apartment/pf with decent management, you will not see this problem