I have arrowhead plant that is growing well but the roots are overgrown from the holes and the color is brown, should i repot it? And is there something wrong with the plant so i have to treat or change the soil?

Yes, it needs a new pot, the next size up. I have that color. The more sunlight it gets, the more pink that "brown" becomes. There is actually a rusty brown and green variety that I have, too. It's a hearty plant I think you'll enjoy as much as i do. But it grows fast and likes to be kept moist. Good luck!

Because roots wander out of the drain holes does not necessarily mean it needs repotting. Disturbing the roots of a plant that is healthy and growing well, as yours is, is often a mistake because if not done properly it can easily damage roots and create problems.

As long as there is enough soil in that pot to keep the roots properly hydrated between once or twice weekly waterings, then that pot size is fine.