No problem. You can add new and relevant evidence and file a supplemental claim; ask for a new look from a senior reviewer or appeal to a veterans law judge requesting a board appeal.
How much time i have to do that?
You have 1 year from the date on your decision to request a decision review.
Oh, o.k, and can i request a higher level review?
Sure, you can request one, but be aware that option isn't available after a higher level review or board appeal.
O., i understand. Say, after that, can i track my claim's status?
Indeed, you can do that.
Great, that's pretty nice. And what's next on these process?
Well, you'll have to wait, just that. After a time, you'll receive a letter from VA.
Have VA scheduled you for an exam?
Yeah, in fact they have scheduled me for that.