How do I push my answers into the top mark band?

Context is essential to push your marks into the top band. With how I was taught, I made a habit of ensuring you could deduce the question from my answer. For example, if the question was "Evaluate the use of a quasi-experiment in the study conducted by Raine" rather than answering the question by stating a positive and negative of quasi experiments generally such as "they are often ethical as the sample are accustomed to the circumstances that are being studied although this often means only a small sample may be available". The answer I would give would incorporate specifics of the Raine study to portray accurate knowledge and understanding of the study.
An example for a negative aspect could be "A negative of using a quasi-eperiment in the case of Raine is the lack of a sample available. To have to use people who are already convicted murderers under NGRI to then study their neurology to decided whether brain abnormalities contribute to towards criminality means the sample is bound to be small because they're a minority people. Therefore, whatever result discovered could not be generalised to a larger population, there would not be sufficient evidence to apply it to anyone other than those who were studied." Try and write a positive one, using specifics of the study.