Time

7-8 months atleast...

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It could take anywhere from 6 months to 12 months. The first step is very necessary and that is to have confidence in yourself. If you don't feel that you can study then you should not do it. Then comes the easier part of just studying hard. You could also use online shopping sites like flipkart, amazon or paytm to buy books. Don't forget to use their respective coupon codes because that way you can save a lot more. You can also visit sites like jagran josh which offer daily articles of importance.