Why do students prefer learning languages by native speakers? Does that help with catching the accent faster?

Learning language from a native speaker have much difference than attending class from a Coaching Center. for catching the slang, it is very necessary to learn language from the native speaker. 

it gives them quick mastering.

yes--sure --that is right--suer that is right

This allow students for more practise &understand the heart&sole of languages

Native speakers are the real speaker of any particular language. They have proper accent, knowledge over phonetics and grammar etc.

Not all of them do, in fact. But those who do, they get a deeper immersion into native tongue and thus a better phonetics, richer lexics and then they Have to speak a foeign language, they have to

yes i help student to learn native languages about the world in order of objects.

yes, a native speaker alos lead you with his best experience of life, bu i think it is also depend on your knowledge effort

BECAUSE THEY TEACH U THE BASIC THINGS WHICH WERE FREQUENTLY USED BY THEM

Native speaker may be more proficient and natural in using the language than non native speakers. 

Yes where they have the ability to imitate, remember and enthusiasm for what is new to them