Sparrow from the East is definitely the more memorable one and the questions tend to be a lot easier than al bakhila and the larvae catcher.
For the film do wajda, as it's the most recent and modern one so is the easiest to understand and write about.
For the research question you do research on any arab country. This section is split into four: tourism, ethnic minorities, festivals and cultural norms. You do research into one of the sub sections and then apply it to the country you are researching (e.g. tourism in Egypt or ethnic minorities in iraq). I'd recommend researching about 2 subsections but one country just in case the questions for one of the subsections is too difficult, you can do the other one.
Have a look at some past papers to understand the exam structure more!