Class 12-science

As you have not provided any of your academics details, so I only tell you the general things:
1.MBBS
The most sought after course, in case of Biology group students. The duration of this course is five and a half years. Academic duration is four and a half years. This is followed by an internship that lasts a year. So, combining them together, the duration of MBBS program turns out to be 5.5 years
2.BDS
BDS stands for Bachelor of Dental Surgery. The course duration is 5 years. Of those 5 years, classroom studies make up 4 years. 1 year is dedicated towards internship
3 B.PHARMACY
Pharmacy course is all about the pharmaceutical sector. It deals with topics such as making medicines, chemicals involved in making of medicines, uses of medicines etc. This course is 4 years long.
4 B.A.M.S.
B.A.M.S. stands for Bachelor of Ayurvedic Medicine and Surgery. If you want to become an Ayurveda Doctor, B.A.M.S. course is for you! The course duration is five and a half years. Four and a half years are dedicated towards classroom courses and rest 1 year towards internship.
5. B.SC. NURSING
In Healthcare sector, the demand for well trained and qualified nurses is huge! The demand is increasing with time, but the supply, the number of qualified nurses graduating each year, is not satisfying this demand! In short, qualified nurses are well valued and are rewarded well for their service
6.B.H.M.S.
B.H.M.S. stands for Bachelor of Homeopathic Medicine and Surgery. This course deals with Homeopathic medicines and procedures in detail. The course duration is five and a half years.

Hi Shivam,
Knowing about various subjects one has to learn in each of these streams helps to get rid of most of the doubts involved with deciding between the two departments.
Engineer Officers - are the ones who handles machinery (Engine). You need to have interest in technical, be physically strong. The working environment is little bit harsh as the temperature can range from 35 to 50 Celsius. Start loving sweat and oil from today (sarcastically), but that is part of job.
Ranks in this dept are as follows
1. Chief Engineer
2. 2nd Eng
3. 3rd Eng
4. 4th Eng
5. Jr. Eng
Deck Department: Those who are not type of techie stuff then this is the best option. A person interested in management type of job will like deck dept. The work of deck officers is to navigate the ship. It's preferable to have good communication skills and leadership qualities.
Ranks are as follows:
Captain
Chief Officer
Second Officer
Third Officer
Trainee Navigating Officer
If we compare deck and engine department after they exit Merchant navy, then I guess marine engineers have better opportunities.
All the best.

Hi Navpreet,
The aspirants who wish to become a Veterinary Doctor should have specific academic qualifications. After higher secondary education, they can go for UG programme in Veterinary Science and Animal Husbandry. Moreover, they are required to pursue this course from any University recognized by the Veterinary Council of India (VCI). The duration of this course is five years. Some of the reputed institutions in India that offer Veterinary Science and Animal Husbandry courses in India are listed below:
College of Veterinary Sciences, Hisar
College of Veterinary and Animal Science, Maharashtra
Bombay Veterinary Science College
Bihar Veterinary College, Patna
All India Institute of Hygiene and Public Health, Kolkata
Admission to these institutes is based on the performance of candidates in national level entrance exams such as All India Pre Veterinary Test (AIPVT), and All India Common Entrance Examination (AICEE) conducted by Veterinary Council of India. Apart from this, certain colleges such as Guru Angad Dev Veterinary & Animal Sciences University and West Bengal University of Animal and Fishery Sciences conduct their own entrance exam as part of admission procedure.
For more details, please follow the college specific websites.