Hello dear,
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You have choosed  a best job,but it is bit difficult when it comes to selection.
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There's nothing you can't do with hope and confidence.
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The best courses to do for NAVY are like based on category wise

• For a category=Masters degree with 55%  in physics with maths with BSC.
• For B category=A degree in law qualifying for emolument as an advocate under the advocate act 1961 with 55%.
• Class B.E,,,B.TECH in civil/Architecture lr graduation in any subject including BCA or it can be even CA.

Hope your point got cleared.

• Best of luck