Hi Akshay,
https://static.careers360.mobi/media/uploads/froala_editor/files/UPSEE-2019-Answer-Key-Paper-1-Code-AA.pdf
The Link above is the answe key for Paper 1 Code-AA. The questions in the other booklets are same only their Serial no., as well as the serial number of their answers are different.
You will find the above, same thing written at the end of the answer key page(page 1) when you open the above link.
So they have published Answer key with their question paper (CODE AA). So first mark the right answers in the Booklet code AA, Then Search the questions in your booklet and match the answers accordingly.
Hopefully this helps.
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