Hi Heeramani,
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.
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 and match the answers accordingly.
Hopefully this help, Comment below for any more queries.
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