Hello
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First you should be eligible according to Eligiblity criteria of journalist. Eligiblity criteria for being journalist is, a candidate must have 10+2 with 50% and a bachelor's degree with 60%.
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Top colleges will conduct its own entrance examination for getting admission into the College for journalism course. Once you complete bachelor's degree you can peruse Higher education or can go for internship and get a job after completion
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Some useful things in a way to journalist are,

• Must be updated with daily news, start reading news papers or watch news channels
• Start filming yourself
• Focus on the type of questions you will get faced or which are important
• if possible start blogging i.e., YouTube channel, it helps you to improve a lot