How many questions will be there from legal or politics as recently I came to know that 100 questions will be asked in the entrance?

It is in the same ratio as it used to be when there were 175 questions. Only the number of question changes but the ratio and syllabuses remain the same.

There is no classification of question numbers. It is percentage wise only and it changes every year. However you can expect a good amount of questions of these 2 sections as compared to the others.