Class 12
For doing MCA you must have a pass degree (BCA/BSc/ BCom /BA ) with min 50-60% and You must have studied maths in 12th or should have Maths as one of the subjects in graduation. You need to qualify entrance exam such as: All India Common Entrance Test (AICET) ,IPU-
For appearing in jee advance you have to score minimum 75% aggregate marks (that means in total ). You don't need to worry a lot about it .For good marks in boards you should strictly follow your ncert book it is quite helpful. To get acquainted with previous year question
These subjects have nothing to do with law, so a better choice would be Engineering, But you can also choose law but then These subjects are of no use, better if you had taken Humanities if you are more interested in Laws. But with this subjects, it is most justified
No you cannot as your latest scores after improvements exam shall b ecounted.
However you are eligible to apear for JeeMain but not eligible for NITs and IIITs and GFTIs and IITs.
If and only if you are in top20 percentile of uour board then only you shall be eligible
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