had 2 jobs since the last financial year and can only find one group certificate?

you need to get the other W2 from the second employer or a copy for federal and state tax withheld. The financial year is calendar year - Jan-Dec. You should have filed by Apr 15 or Aug 15 with extension, or oct 15 if applied for extra time and approved. File anyway, because if refund is due you can get it.
 
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