Hello,

You wont get branch related papers outside the board who conducts the exam. Every board has its own database and uploads all the papers there. You can look for it in the webpage of your univeristy. The webpage for you students will be different so ask your seniors to help you out to know how to get the previous year papers. They are the only source to get them. if it not available there then ask your respective subject teacher to give you. they have those papers mostly for reference.

If you won't get from these then you won't get it from anywhere. You will get it from your university only. No other webpage can give you.

You can look for the notes for your branch in lecturenotes webpage. They have all kind of sources for engineering stream

Hope it helps!