Hello Student,

Practicing past 15 years question papers covers a vast variety of questions asked in the exam. The decision to solve more papers depends on your analysis of performance in these papers. If you will that you are well prepared and are able to answer almost all questions then you can skip solving 30 years question paper. However another m ethod culd be to go through the papers and identify questions different from thsoe you have already practiced and then solving those questions only. This way you will get the exposure and save on time.

Hope this helps.

All the best!