High school does not count toward the educational credits.
Here are the IRS definitions for at least a 1/2 time student, quoted from form 1098-T instructions "
"Box 8. Check if at Least Half-Time Student
Check this box if the student was at least a half-time student during any academic period that began in 2011. A half-time student is a student enrolled for at least half the full-time academic workload for the course of study the student is pursuing. Your institution's standard for a half-time student work load must equal or exceed the standards established by the Department of Education under the Higher Education Act and set forth in 34 C.F.R. section 674.2(b). "
Here are the IRS definitions for full time student from PUB 17
"Full-time student. A full-time student is a student who is enrolled for the number of hours or courses the school considers to be full-time attendance.
Student defined. To qualify as a student, your child must be, during some part of each of any 5 calendar months of the year:
1. A full-time student at a school that has a regular teaching staff, course of study, and a regularly enrolled student body at the school, or
2. A student taking a full-time, on-farm training course given by a school described in (1), or by a state, county, or local government agency.
The 5 calendar months do not have to be consecutive.
School defined. A school can be an elementary school, junior or senior high school, college, university, or technical, trade, or mechanical school. However, an on-the-job training course, correspondence school, or school offering courses only through the Internet does not count as a school.
Vocational high school students. Students who work on “co-op” jobs in private industry as a part of a school's regular course of classroom and practical training are considered full-time students. "
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**