Hi,
I was able to find some question papers only.
Here is a link to 2017 IISER Aptitude Test Question Paper-> https://drive.google.com/file/d/1EDQNvqMwU5DbbkbnU1fSe-0XGVbAJ6eh/view
You can also try solving this sample paper-> https://drive.google.com/file/d/1OiCSt_-qwMDKGEBG-T5VcTB4F7H4u_B6/view
Also, some students have also uploaded images of their question papers, so give a quick google search and you'll find some more.
Hope this helps.
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