You may take part in our discussions here. We solve a question, at least, within two days in this thread. All the members of this thread, check one anthers' answers and then evaluate them by pointing out mistakes and sharing their knowledge. It is a beneficial practice. Thereby, you will be able to solve past papers with good grasp.

Moreover, if you are interested to solve them by your own without participating in this thread. It is your choice; and also better. For that you will have to download the past papers from this forum or obtain them from elsewhere. After carefully reading the past papers, point out the question which appear most important to you.

Solving papers is easy because psychology is a general subject. Before answering a question, just thoroughly read from diverse sources i.e, internet, books, about the topic and then attempt it.