This is perhaps the most important step in your preparation. How do you go about selecting the right optional? I have heard many aspirants say that they have selected a certain optional because it is scoring. This is perhaps the biggest myth surrounding this exam.
When you think that an optional is scoring you are probably you are looking at the high scores some of the aspirants have got in that optional. You must ask yourself if the optional would be scoring for YOU.
For this you need to see the syllabus, your interest in the subject, your aptitude, available guidance, availability of course material and then decide if this optional will work for you.
Often a wrong choice can waste 4 or 5 years of your life without any outcome.