Science & Technology, is an important area from which important of questions come in UPSC & State PSC, prelims and mains. If someone has done exceptionally well in Science & Technology, it is likely that his/her difference from others will still be less. On the other hand people have been awarded higher marks in optional, so that if someone has done exceptionally well in optional, he/she will score a lot of marks more than others. UPSC is a relative exam, only difference of marks matters.