The personal statement is also a great place to explain more serious problems, like less_than_ideal grades or test scores. Don't be afraid to write something like, "I don't test well" in the statement. As long as you can provide a good reason for you app's problems, it's okay to address them directly. You won't be able to hide it from admissions officers anyway, so providing a reason for problems is always preferable to ignoring them.
The most convincing personal statements often consist of your academic records, accomplishments, and extra_curricular activities. It may also include any incredible circumstances, challenges, or adversities you have faced and the manner in which those bottlenecks have been overcome. There is nothing wrong in mentioning about your initiative, inspiration, headship, perseverance, and your ample experience in moving with other cultures. In short, all positive qualities or all achievements in light of the opportunities available to you can be mentioned.