Science

After completing B.Sc in cardiology s programme, you may get recruited by
Government Hospitals
Private Hospitals
Emergency Medical Services
you may don the following roles
Cardiac care technician
Cardiac care technologist
salary will be around 5lacs per annum. B.Sc. In neuroscience may not directly prepare students for the job market. This is a emerging area which requires super-speciality. The objective of undergraduate programme in neuroscience is to help students prepare for advanced degree in the neuroscience or related areas. The students should try to pursue Masters degree in related areas. You can be employed in research institutes or Universities after that.

CTET forms are closed right now for the 2018, you can go for 2019. The CTET exam is conducted by central board of secondary education to determine the eligibility criteria of the candidates who want to get a job in the CBSE affiliated schools as a teacher. CTET is a certificate test means after clearing the CTET exam one is provided an eligible certificate through which you can apply in any government or private CBSE School. And, based on the vacancy and your performance in the interview, you will be selected as a teacher in one of the CBSE affiliated schools. So, if you want to go for the CBSE teacher profession then, yes, it is necessary to sit for the CTET examination and clear it with more than minimum cut-off marks. Forms are available online.
Good luck.

Yes, it is. You could appear for UCEED exam that is the IIT entrance exam for B. Des courses for all the IITs that offer an undergraduate Design degree. To appear in UCEED, the eligibility is clearing class XII-th in any stream. Why I recommend the UCEED for you is, because as your interest is in Car Design, having a B. Des degree from a technology institute works better, as you get exposure to the engineering side of things as well. After your undergraduate degree you could take up a dedicated Master's degree specialization in Automobile or Transport Design. There are a few private colleges who offer this Master's programme in India besides the Master's programme at NID as well. Internationally too, there are many Institutes and Universities offering dedicated courses in car / automobile design, where the eligibility is not stream specific and anyone clearing Class XII-th can apply.