While entering the class 12 marks we have to consider best of 5 subjects or the same way we considered 6 subjects in CAT?
You are required to include the marks of all the subjects for the calculation of percentage.
You need to include your optional subjects as well (if any).
It is advisable to not leave the optional papers mark and do not enter 100 as your percentage.
The IIMs are very strict and very particular about this things.
So please fill out the details properly.