Are you sure about that? Vocational schools are excluded from the eligibility requirement. It needs to be a high school course that by itself is acceptable for entry to a US college. Most vocational schools do not meet that requirement and I’d be surprised if a technical high school in Ghana does. We have certainly seen people on these boards denied before for having vocational/technical high school only. Cannot remember specifically if any of those were from Ghana.
https://fam.state.gov/fam/09FAM/09FAM050206.html
Formal course of elementary and secondary education comparable to completion of 12 years of elementary and secondary education in the United States. Because a United States high school education is sufficient in itself to qualify a student to apply for college admission, in order for a foreign education to be equivalent to a United States education, it should be sufficient to allow a student to apply for college admission without further education.
Vocational degrees that are not considered a basis for further academic study will not be considered equivalent to United States high school education.
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One possibility, if high school will be completed before fiscal year end, will be to ask for AP and submit the certificate when completed. From the same source as above:
You must adjudicate the applicant’s qualifications under this requirement. In order to enter or apply for a visa under the DV program, the alien need not prove that this requirement is met. The applicant must, however, meet this requirement by the end of the fiscal year in which selected and present evidence of completion to the satisfaction of the consular officer. If the applicant does not meet the requirement at the time of the visa interview, you should refuse the case under INA 212 (a)(5)(A).
If the applicant presents evidence of completion of high school before the end of the fiscal year, and visas are still available for the region, you may overcome the refusal.