You need to know about vectors to study higher areas of mathematics, such as linear algebra and even vector calculus, both of which are steps you might take during or after studying calculus. 

So you mean Ayesha miss the matrices and vectors on pre calculus section, then go back to it after iv learned calculus and vector calculus? I just love maths thanks to Khan academy helping me put faith of maths back in me.

No, you need to know vectors before you go on to some branches of calculus and vector calculus. So, you should study matrices and vectors in pre-calculus before moving forward with calculus.