LRH makes it very clear what it takes to achieve full conceptual understanding:
“Operating within a society steeped in misunderstood words and misdefinitions, study tech is subject to arbitraries. Thus, a CLEARED WORD is defined as follows:
A WORD WHICH HAS BEEN CLEARED TO THE POINT OF FULL CONCEPTUAL UNDERSTANDING.
… There are many ways and combinations to achieve this EP. Using the word in sentences until the meaning is grasped conceptually is the most common. Diagrams, demos, clay, in fact the entire body of study tech and its methods are applicable.
These are vital tools. For use. Protect them and KEEP SCIENTOLOGY WORKING.”
HCOB 7 September 1974
Word Clearing Series 54, Superliteracy and the Cleared Word
(Subject Vol. 2, p. 276)