Question

which is correct - do you know or you know what ? i know the first one is grammaticly correct but i have heard people saying you know what . so please anyone clear my doubt .

Answer 1

do you know is grammaticaly correct , you know what can be used as a simple way of expressing in informal way of speech

Answer 2

do you know .......kya tum jaante ho

first one.....asked question from u.....ki tum kya jaante ho

and
you. know what .........tum kya jaante ho

second one......asked question from u....tumhre pas kitna knowledge h.

hope it helps u.