Hello,

You can not predict exactly how many marks you will get just by solving the past year question papers. But To score good marks you should know the concepts well of the three subjects. Once the basics are clear then do the previous years papers and mock tests, as these will give you an idea on how questions were asked on the topics you have studied and allows you to manage time. Also some questions may be repeated by just changing some values.

So it sure helps if you do more and more previous years papers, but we cant predict how much you will get exactly.

Hope this helps

Good Luck