Ok so I’m pretty sure my grandmother claimed me on her taxes and when I file they keep getting rejected how do I fix that?

first, you have to determine if it was proper for another taxpayer to claim you as a qualifying child or relative.  if you are you need to check you can be claimed as a dependent. this will allow you to e-file provided there are no other issues with your return because that box was not originally checked. if you're neither then all you can do is file by mail and include form 14039 - Identity Theft Affidavit and indicate by checking the box that you were incorrectly claimed as a dependent. (Box 1 in Section B) also read thru the rest of the form for required details.  then attach this Form 14039 to the back of your paper tax return and submit to the IRS location where you normally file your tax return.

You could be claimed as a qualifying child if all these tests are met

• You have the same principal abode as the other party for more than ½ the tax year.  Temporary absences like for school are ignored
• If not a full-time student, you’re under 19 at the end of the tax year.  If a full-time student under 24 at end of tax year.  
• you haven't provided over ½ your own support
• you didn't file a joint return unless there was no tax liability but merely filing jointly to facilitate refund of taxes withheld or estimates paid

Or as you could be a qualifying relative if all these test are met

      You’re related to the other person or, if not, lived with the other party for the entire year and

• your gross income for 2020 less than $4,300
• the other party provided over ½ your support
• you aren't a qualifying child of another taxpayer