A correspondance course eh? This question certainly provides a good illustration of the reduction in standards
Time was that to certify electrical systems called for a type rated "X" Electrical licence. This required three years practical experience backed by certified worksheets, six months on type with a complete schedule of inspection work covering every piece of electrical equipment in the aircraft, a 'pass' result on an approved aircraft type course, a 180 question multi choice paper and a six question essay paper. This gained you admission to a six hour oral grilling to get the licence. Similar rules applied to "A" "C" "X" Instruments and "R" Radio.
Now, that may have been overkill, but it certainly highlights the fall in standards represented by JAR 66
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Through difficulties to the cinema