European Languages
Spanish, French, and German language certifications
3 exams, 3 with a pass rate published by the body that sets them. The cheapest is DELF/DALF (French) at $100-$350.
DELE (Spanish)
Instituto Cervantes
$110-$185·~70-85% pass
VariesLifetime
B2 recommended for professional use
DELF/DALF (French)
French Ministry of Education
$100-$350·~75-85% pass
VariesLifetime
B2 for university admission in France
Goethe-Zertifikat (German)
Goethe-Institut
$150-$350·~70-80% pass
VariesLifetime
B1 for visa, B2-C1 for university