Dear all~ Please check the grammar in each sentence. Thank you so much!!!!

I want to get 500 points for TOEFL test.
I want to buy a house for me and my family.
I want to have a young face like 25 years old.
I want to prepare for the Master exam.
I want to study in the university for get master degree.
I want to get the soil and water conservation technician certificate.
I want to get a job as an engineer of soil and water conservation.
I want to get an English diploma.
I want to start university classes.
I want to get a certificate about my major.
I want to graduate from university and prepare to go to graduate school.