First time filing, how many of my past w-2 can I add to my 2017-18 taxes?

My mom has always claimed me on her taxes and this year since her being sick and unemployed I'm claiming  her. I have past w2 from my recent job in 2016 and 2017 and 2 others old jobs in 2016.  And I just got my new one. Can I add these w-2 to my taxes for 2018 and file them .