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The process comprises three stages:
1. SELECTION PHASE I (WRITTEN TEST):Physics TestMathematics TestEnglish Language Test
Applicants who are successful at phase I will proceed on to phase II.
2. SELECTION PHASE II CAE AIRCREW SELECTION SYSTEM (CASS)
Candidates will perform two online profiling tests before presenting themselves at one of the test-centers spread across India for an Interview, a physical assessment, psychometric test and a debriefing session. The applicant is allowed to the next phase upon successful completion of phase II. Applicants who are successful in phase II will be invited to attend the final selection phase with IndiGo.
3. SELECTION PHASE III
The final selection phase consists of a Group Activity / Discussion and Personal Interview. Successful candidates will be notified personally. There's no difference in selection procedure, it is same for Domestic as well as International Pathways.

Yes, you can pursue marine engineering through IIT.
Marine Engineering deals with manufacture, design and operation of ship machinery and engines. There is good scope of marine engineering courses in India. This is the best field for getting excellent government jobs. Marine engineering has gained great popularity in India. Plenty of students are attracted towards this advanced branch of engineering. Scope of marine engineering courses offers remunerative career options on and off shores. The employment opportunities are available in Merchant Navy, Navy and manufacturing industries. Offshore job opportunities are available in recruitment in ports, government jobs. The marine engineers can also work as teachers in the educational institutes. There are numerous institutions established in various states of India, like, IIT Mumbai, IIT Madras, IIT Kharagpur, International Institute of Maritime Science, College of Engineering, C V Raman College of Engineering, etc.