On which subjects should I concentrate more in the light of Civil Services preparation while studying 3rd B.Tech? Is it compulsory to join in a coaching center?

hello sir,
iam studying B.Tech 3rd year so i want to prepare to civil service commission so what are the subjects i had to concentrate and is it compulsory to join in ias institute?

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For the exam you need to concentrate more on the subjects in which you find difficulties more.So you can practise them more and more and also take care of the optionals you choose as they help you to score more in the exam and for joining institute you can either join it or not it also depends on you as I my opinion the coaching classes help you to learn the refined information and you can prepare yourself more efficiently....