Science student need helps

I think he needs to have the core science subjects compulsorily, like: Biology, Physics, Chemistry in +2 level. Without it how can he go for higher medical studies?

This link might give you some idea:

https://www.indiaeducation.net/Alerts/Veterinary-Council-of-India-VCI-All-India-Pre-Veterinary-Test-AIPVT-2011-15122010/

Now, you don't necessarily need to be a doctor just because you like animals, if you can't do justice with the job. Just like if one likes cars he/ she need not to be an engineer to like it.

Ask him to analyse things properly, understanding what he shall be supposed to do as a vet/ doctor, would he able to do it? will he able to do justice with it?

What is feel a lot of people don't really understand the responsibilities of being a doctor and go for it, don't get offended, it's a thing I've observed, even in case of my cousin and some close friends too. I can't judge your brother, maybe you can do it.

For me being a doctor was a big no-no, even though I'd like helping people from their misery, but I cannot stand cutting/ slicing/ stitching/ seeing blood at all and most of all, I wasn't good at sciences.. 

To practice as a veterinarian it is essential to have a Bachelor's degree in Veterinary Science (B.V.Sc.). To be eligible for the Bachelor's in Veterinary Science and Animal Husbandry (B.V.Sc & AH) course, a candidate should have passed the class 12 examination with science subjects such as Physics, Che mistry and Biology. 

Selection : Admission to most veterinary colleges is on the basis of results obtained in the entrance examination conducted by the concerned universities. Veterinary Council of India conducts an 'All India Common Entrance examination' (AICEE) for admission to first year Bachelor of Veterinary Science (BVSc) & Animal Husbandry (AH) degree course for filling up 15% of the total number of seats of each veterinary college of all states; about 36 colleges where Indian Veterinary council Act, 1984 extends. This Entrance exam is usually held in the month of May each year. For admission to masters degree programme, an All India Entrance Examination is conducted by the Indian Council for Agricultural Research (ICAR).

Duration : The duration of the BVSc & AH varies from four and a half  years to five years, including the period of internship. The first four years of the training programme are devoted to imparting skills through theoretical and practical training in various disciplines, like anatomy, physiology, biochemistry, nutrition, livestock management and production, production technology, pathology, microbiology, pharmacology, genetics and breeding, gynaecology, surgery, medicine and animal husbandry extension, among others and the fifth year is devoted to hands-on training, of which six months is through internship. The internship includes three months’ training at the Teaching Veterinary Clinical Service Complex (TVCSC) under the supervision of a senior clinician and in field veterinary hospitals on a rotation basis. Veterinary students undergo a one-month practical training in livestock production and management at animal farms, then one-month training in poultry production and management and another one-month training in livestock products’ technology and other services. Apart from learning to treat animals, training is also provided in dairying and poultry sciences.  Generally after doing B.VSc, most candidates go on to do a post graduation, namely a Master in Veterinary Science. The Postgraduate course in Veterinary Science (M.V.Sc.) is a 2 year course and the candidate has the option to specialize in areas like medicine, surgery, anatomy, bacteriology, biochemistry, cardiology, dermatology, microbiology, molecular biology, anaesthesia, gynaecology, pathology, toxicology, virology pharmacology, etc. For jobs in the research and teaching areas, a post-graduate degree in veterinary science and animal husbandry is a minimum qualification, while a Ph.D. is preferred. 

Personal Skills : 
The first and foremost attribute required for a good veterinarian is genuine love and compassion for animals. A good vet must read the signs from the animal's behavior and diagnose the ailment. As the animals cannot describe the problem, vets have to diagnose it skillfully. Vets must also be able to handle emergencies and work in physically disagreeable conditions, or in rural areas where working hours may be long and irregular, and working conditions uncomfortable. Working with large animals requires physical stamina and quick body reflexes to tackle the animal's moody behavior and should be able to instinctively gauge the animal's condition. A vet should have the ability to put the animals at ease, to do teamwork, have powers of observation and self reliance, adaptability, indifference to the occasionally disagreeable conditions of work. He needs to be extra sensitive and patient.