If you have to prepare for an exam then you may want to look for test banks and solution manuals online that should help you with your preparations. Several websites provide a huge range of test banks and solution manuals that you could take advantage of when preparing for your tests. The problem with exams is that questions can appear in a different way to what you might be used to and hence if you do not have access to past papers you will not have an idea on what sort of preparations you will need to make.
Past papers have always been known to be the best way to get practice tests and when you have this available online together with their respective solutions as recommended by the examiner then you would obviously have access to the best preparation material for your exams. The only thing being, you will have to be careful about the website that you use for such test banks and solution manuals as not every website can be trusted given that the internet tends to be an open platform that can be used by anyone.
You can therefore never trust anything unless you are careful about it. Once you have found the right website that can be trusted, it will then be a straightforward process for you to go ahead and benefit from it when it has been as you would love to.