Science

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Yes, you can take admission in B.Com. Science stream students can take admission to any course they want, provided that you meet the required 12th percentage.

The questions are generally based on graduation level. It would be best if you buy 10 years previous year question papers to practice.
Zoology: Eligibility - The minimum eligibility criterion for a student to take admission in B.Sc. Zoology is that the candidate must have studied Physics, Chemistry,

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Please check the syllabus on the website of the college/university you want the admission in.

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The admissions will start in the month of April/May, but you will have to check the website and the prospectus for the complete details.

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As you have already completed Degree in B.Sc electronics, you should pursue the same in your M.Sc. as well. Changing the stream would not be of much use.

Yes, you can go for Diploma in forensic science after competing your B.Tech degree, but it would not be of much benefit.

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No, you cannot pursue two courses simultaneously. It would be better to complete B.Sc first and then go for MBA.

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Yes, you should definitely pursue this course. It would be very beneficial for you. After completing MBA, you will have a complete corporate profile and thus you will get very good jobs.

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To pursue engineering, you have to give the JEE exam which will get you admission in all the IITs, BITS conducts its own exam. For B.Sc, you can try in DU through cutoff or appear in entrance exams.