These are the four documents you need for undergraduate admission/scholarship in the United States of America.
SAT: It is an exam that’s equivalent to the UTME for freshman admission into a Nigerian university. It’s managed by College Board. Register for Scholastic Aptitude Test (SAT) online at collegeboard(dot)org. Once you’ve registered, start preparing. It’s NOT a cheap exam, so prepare well. Preparation materials are available. There are centres in Abuja and Lagos where you can sit for the exam. Alright?
WASSCE: You need a good West African Senior Secondary Certificate Examination (WASSCE) grade. Credit is the minimum. WAEC GCE is accepted also. You can use a Statement of Result or an original certificate.
𝗧𝗿𝗮𝗻𝘀𝗰𝗿𝗶𝗽𝘁: Your results from SS1-SS3. Go to your secondary school and ask the principal to compile the senior secondary termly results into a single document. Then they will come up with your average score per term… and using a scale or percentage system, they will compute your CGPA. They should stamp it and sign, with the school name and logo showing on the header.
𝗟𝗲𝘁𝘁𝗲𝗿 𝗼𝗳 𝗥𝗲𝗰𝗼𝗺𝗺𝗲𝗻𝗱𝗮𝘁𝗶𝗼𝗻: You need about 3 letters of recommendation. It can be written by your principal, vice principal, Rev’d Father, community leader, traditional ruler, head teacher, or manager of a corporation. It should be written on a letterhead. It’s important. You need to attach them to your application.
Some schools may require that you present proof of English Language Proficiency. You can also do this by sitting for an English Language Test.
The two popular ones are TOEFL and IELTS:
TOEFL is the Test of English as a Foreign Language.
IELTS is the International English Language Test System.
With these, you are ready to apply for admission. Complete the application online by yourself. Everything is done online, on the website of the school you’re interested in.
However, students with high GPAs and high SATs are usually awarded SCHOLARSHIP by the school of their choice. Also, the US Presidential Scholarship awards students that performed well.
You may also access other scholarships, such as alumni funding, non-dominant group incentives, first-generation student aid, and stuff like that. Good luck.