Hey bhaskar, it depends totally upon u whether u wanna make it once or in part, but as the CS exam are contiuous without any break, so it is really hard to clear them in one attempt. as sometimes we cant focus on other subjects while preparing for any hard one so it has effect on the marksheet too............in my opinion if u cn devote equal attention to all the subjects then u should go for it champ.....but if not then u should go for it in part..........rest is upto u
Best of Luck