Hello kid,
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Yes, NEET is the only entrance examination for entry into varies Medical courses. You need NEET for entry into BAMS courses. Fee structure varies from college to college in general it will be in between 25,000 to 5 lakhs per annum.
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Now if you are going for management quota then the fee will be 3 of the Normal fee. So do check with the College you are interested in for exact fee details