Hi

You can download previous year question papers of NSO by visiting our page the link for the same is provided below

https://school.careers360.com/articles/nso-sample-papers

You can download previous year question papers of IMO by visiting our page the link for the same is provided below

https://school.careers360.com/articles/imo-sample-papers

These  papers will help you to understand the examination pattern, types of questions which are asked in exam, difficulty level of the examination, you will also get an idea of  the important topics which are covered in the exam by practising them so that you can accordingly prepare for the exam , you will also get to know your preparation level

Best of luck for your exam preparation

Thank you