Yes. Both the old and new A level physics past papers are given in this website as some of the old Physics past paper questions are still relevant and useful for students studying the new curriculum.
There is not necessarily a best way to use the A level physics past papers but it is good advice to use them sparingly as they are a scarce and valuable resource. Using the exam papers to monitor the progress of revision and to identify gaps is always useful.
The mark schemes are available on the same page as the A Level physics past papers, simply click through to the exam board page you want and the paper and mark schemes.