Hello Shubham,
Go through the following link and you will find the IISER Aptitude test papers of 2018 -
https://drive.google.com/drive/folders/1ePOr3rYF-bc5QKjqvbV8atR97LtM-5RU
https://drive.google.com/drive/folders/1k3kBVsAMAe59PLCFRuySTTykXL0zlRPe
Good luck!
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