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Dear aspirant, Great interacting with you. If you want to get admission, you need to score 240 marks out of 400 minimum. If we talk about reading comprehension, carry 10 questions from each subject, means we have 20 questions and a chance to get 80 marks
Similarly, approximately 8-9 questions come from the reasoning part, it is the most scoring section, there is the chance to get 32-36 marks ( each question is for 4 marks in every section)
Now come to the general Science section, 18-19 questions carry the Science part where 5 for Physics 7 for Chemistry and 10 from Biology if we correct approximately 13-14 questions, get 56 marks in this section
In social Science approximately 25-30 questions, 4-6 from history, 5-8 from geography, 5 from the polity, 3-6 from economics. SEE the questions that come from this area are up to 12th, so its problematic for Science students to solve every question from social Science
Similarly, its problematic for humanities students to solve every question from the Science section
So you guys need to focus on that subject which you already studied rather than a new subject, need to get more perfect in that field where you already jumped. Hope it helps. If you found it useful then upvote or thumbs up my answer. Good luck.

Hi Akshay,
You can join merchant navy directly after class 12th by clearing the NDA (National Defense Academy) exam or IIT-JEE.
Following is the eligibility criteria for the same:
1. Candidates must have completed class 12th with PCM subjects from any recognised institute.
2. You must have at least 55% in class 12th.
3. Must pass a medical fitness test for sea service under standard norms and with eyesight 6/6 with no colour blindness.
For more details, kindly visit the links mentioned below:
http://nda.nic.in/eligibility criteria.html
http://career.webindia123.com/career/options/defence_government/merchant_navy/eligibility.htm for more details