The noun aptitude is an uncountable noun; amounts of aptitude is
expressed as some aptitude, a little aptitude, great aptitude,
etc.
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For a fresh Graduate there are various kinds
of Aptitude Tests such as the GATE Exam for engineers and the CAT
exam for people who would like to pursue their post-graduation in
the field of business. It depends on which stream you would like to
pursue your Masters.
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There are no perfect rhymes for the word aptitude.