What to choose after cl10 .plz help?

I m vry confused between maths and bio .I like studing bio , not maths but the problem is that I want to become an IAS with one job in my hand before IAS and if I take bio then it wl take lot of year to have a job. MY optional sub is Geography and if I take maths then I would like to go for IITs and choose geography related fields. PLZ TL WHAT TO DO Is cl 11 maths boring and difficult plz hlp