About 99% of the CBSE school give NCERT questions of class 10th in the entrance exams for admission to class 11th and about NCERT of te question paper cntain 8587% NCERT. So you should cover your NCERT for entrance exams.
And the second option is a website called
http://www.mycbse.in   go there and u may find your question papers or else just type in Google for late years question paper and the site I mentioned would pop up in first 5 suggestions

Thank you :)