It is important that you add evidence that VA did not have before it is relevant to your case.
Among your doubts is whether you can file a supplemental claim?
Yes
You can file a Supplemental Claim within 1 year of a decision if you have new evidence, unless one of these rare situations applies to you.
and how long do I have to file the claim?
to make this claim You have up to 1 year from the date of your decision to file a Supplemental Claim.
And where can I find more information on how to present the evidence?
For more details, see the instructions to complete the form. we will gladly supply you shortly
What should I do after the VA program schedules the exams?
If the VA schedules the exams for you, be sure not to miss them.
Where can i get more information?