Yes, in order to qualify for the Lifetime Learning credit, you must have made tuition and fee payments to a post-secondary school (after high school) during the year.
You can claim the credit for any post-secondary classes you take; you don't have to be working towards a degree. Some limitations do exist though.
If you earn too much income during the year, you may not be eligible to claim the credit. However, this also depends on your filing status.
See What Is the Lifetime Learning Tax Credit?
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