CBSE 12th

Are you serious? With 54% in 12th and you are asking for 'BEST' college of CSE? I think you should to think 100 of times before doing this! But well for the sake of your answer I think Galgotias University can give you the CSE (they took entrance so kindly go their website for more info) or else, you can go for 'Ganga Group of instutions' they don't even ask for any entrance. But dear don't never ever think of placement with this % bcoz some company set the criteria for shortlisting the candidate. They don't allow to sit in interviews who has less than 70% in 10th and 12th. So again! Think again for engineering. I think you should to go for another stream!
Best of Luck!

To become a judge, first of all, you will have to be a graduate in law.
The students from any stream can take up the law course. So you can choose Arts also in 11th
After completing your 10+2 studies you will have to give some entrance exams for doing the L.LB One of the most common entrance Being CLAT (Common Law Admission Test )
For appearing in the CLAT exam you must have completed 10+2 studies with a minimum of 50% marks. However a relaxation of 5% is given to the SC/ST/OBC and physically handicapped candidates.
The criteria for Most of the other entrances will also be the same. There may also be an upper age limit of 20 years for General candidate.
But these may vary from one entrance exam to another.
In CLAT exam questions will be asked from Legal aptitude, logical reasoning, English General Knowledge and elementary mathematics.
After completing graduation in Law you will have to give the Judicial service exams. These are state level exams conducted by the respective state government.
To be eligible for this exam you must have passed all the exams of L.LB in first attempt and also you must have secured a minimum of 55% marks in the final year examination.