Is it a must to collect resources from previous students to be a successful student?
No.  It is not normal for students to use a student-collected database of old questions.  I know this is done at some universities, but personally I have never seen one.

The proper thing is for faculty to supply sufficient quality and quantity of study material that students will not benefit from these databases of old questions.  Faculty also should not reuse test questions which might be in a student-collected database, but not in the study materials.  

When faculty reuse tests and keep the content "secret," then student-collected databases create unfair advantages for certain student groups.  These groups often exclude minority students.  This is an unacceptable practice.