Solving previous year question papers, sample papers and giving other mock tests is a very important factor especially when you're preparing for some competitive entrance examination. It will help you to analyze the syllabus and pattern well and also make you understand where do you stand and what all things more you need to cover to be ready for the exam. So here is the link for sample papers, do refer to it..

https://school.careers360.com/articles/ntse-west-bengal-question-papers Best wishes. Thank you.