Sit down with your parents or home-school teacher and create a list of courses you took in high school. You can refer to a professional transcript-creator guide if you need assistance determining what weighted grade you received in each class. Have your parents list each course name, the class duration, what grade you received in the course and how many credit hours the course was worth.
Submit your high school coursework to a professional transcript company, which can help make your transcripts readable and organized in a fashion that appeals to college admissions personnel. You will have to pay a fee for this service.
Contact the admissions department of your correspondence high school if you participated in long-distance learning from home. Some home-school students choose to learn from accredited institutions and these schools can provide you with a copy of your complete high school transcript. Note that some schools charge for this service.