TOEFL Help required

I am new to this forum. I want to take addmission in a university in Masters Of Physiotherapy and the language reuirements for the university is 250 ou of 300 for CBT and 100 out of 120 for IBT. The essay score required is 5. i once attempt TOEFL in this april and got 230 marks. All the fields were almost Ok. except Essay i only get 3 points in essay. that frustrates me a lot. if i would have 5 in essay i can do both the 250 in aggregate and 5 in essay and i will have got addmission in that course. Now I am here with you people and hope you will help me in writing essasy and one day i will succeed in my aim.
Rashid Hafeez

TOEFL listening lectures: What does DNA analysis reveal about the domestication of horses?