CBSE 12th

Hi Vivan,
After PCB, you can consider
1. MBBS
2. Biochemistry
3. B.Sc Biology
4. B.Sc Botany
5. B.Sc Zoology
6. Bachelor of Agriculture
7. Bachelor in Diary Farming
8. Health and Fitness
9. Food and Nutrition
and many more. Which course you should pursue is one thing you must decide as per your own interests. Know what you want and study what you will most likely enjoy.
Different colleges have different minimum eligibility. You must also try for the entrance exams like AIPMT - All India Pre – Medical / Pre - Dental Entrance Test , AIPVT - All India Pre-Veterinary Test , COMED-K, AMU (MBBS), AIIMS, Manipal (MBBS) and other state-level medical exams.

AutoCAD jobs are within specific industries - architecture, engineering, manufacturing, and more - you are hired to do AutoCAD as it relates to the business of your employer, so you must know something about his field (otherwise how would you know what goes into the drawing?)
It is a tool within a discipline, not a discipline unto itself, such as schoolteaching. So if you study AutoCAD (you need it, or skill in a less popular software to get any sort of design job at all), study it where they teach design courses. Since AutoCAD is really computerized drafting, be sure you understand drafting, and be sure you study AutoCAD in a class oriented to the industry you will be in (ie-don't take it where they teach engineers). If you have some basic skills and AutoCAD, you make get an Intern job where you can learn more and eventually do space planning. CADD centre offers training in CAD tools all over India.