Hii Omkar!
Though some websites and portals provide you sample papers in the pdf form related to different subjects, its quite difficult to search for them or in some cases to download them. So, I would suggest you to go for books. Search for sample papers and previous year question papers which will provide you more number of questions of each type related to the subject. You can even order them online through e- shopping websites. And one more suggestion - when you read a chapter in NCERT, try to make questions from each line ( sentence ) and paragraph in it and answer them. This way, you will get an idea of possible questions and eventually you will become more focused while studying and end up remembering things. Hope this helps.
Good luck!