Is certain optionals have better prospects at the preliminary?

The UPSC offers 23 optionals  in the preliminary. All optionals  offer equal chances of success. Usually the ” scaling System ” is followed. This method may be explained as follows:Total no.of candidates appearing at the examination with various optionals = 1,00,00. Total no. of candidates to be selected for the Main Examination  = 10,000. Candidates taking History = 20,000. Minimum representation to be secured of candidates who have opted for history = 2,000. Thus, every optional is weighted proportionally.