<p>I haven’t heard of either of those. I use:</p>
<p>[Keystone</a> High School, Online High School, Online High School Diploma](<a href=“http://www.keystonehighschool.com%5DKeystone”>http://www.keystonehighschool.com)</p>
<p>The National High School you listed does not appear to be regionally accredited. (Essentially) the only accreditation that is important is a REGIONAL accreditation.</p>
<p>ETA: On second thought, it may be regionally accredited. Either way, triple check.</p>