help me to answer this, thank you

Consider yourself as a statistician. The Graduate Record Exam (GRE) is a standardized test required to be admitted to many graduate schools. A high score in the GRE makes admission more likely. According to the Educational Testing Service, the mean score for takers of GRE who do not have training courses is 555 with a standard deviation of 139. Brainpower Philippines (BP) offers expensive GRE training courses, claiming their graduates score better than those who have not taken any training courses. To test the company's claim, you as a statistician randomly selected 30 graduates of BP and asked their GRE scores. The random sample of 30 graduates he obtains recorded a mean score of 560 in GRE. Formulate the null and alternative hypotheses, then identify the test statistic to be used