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M.B.A is open to graduates of all streams like B.Sc, B.A, MBBS, BDS, B.E . First concentrate on short term goal, like in graduation what stream you will choose. Accordingly choose stream for Higher Secondary depending upon you interest and aptitude.
Believe me all subjects are good and important. Any subject can be good for you to choose provided the subject should be really interesting for you and you have the aptitude for the same.
Mostly at this stage children have pressures and fascination to choose science. But other streams are good and you may rise high. So choose any stream you feel is important for you and hone all the necessary SKILLS. Please note the word "SKILL" .
All the Best (y)

M.C.A will be good for you. It is a professional P.G course and will make you super specialized in in the field of I.T and Computers. After M.C.A you can get jobs as lecturer or faculty or process trainer in Academic Institutions, Corporate Training Centers, Training and Development Section of HR - departments. You can be a Trainer, Training Manager , System Administrator.
If you choose M.Sc. (Physics) with specialization in electronics, employers will always have a doubt in you practical abilities and this type of degree emphasizes on theories more on theory. You will need to get through UGC - CSIR , NET for Lecturership or JRF , then 5-6 yrs. Ph.D with stipend. Then you have to apply in various colleges where in you will find semi-qualified people will be more preferred as they would do the same job with lesser salary than what you will expect for yourself after so much labor.
So, with lots of analysis of your future needs and current job scenario I will suggest you that -
Doing M.C.A will be a very wise action. Rest depends upon your interest and inclination.
All the best (y)