Theerapun,
Here's the difference between traditional reading and PR.
If you elect to use regular reading ... then really what you are doing is 'memorizing' the material temporarily and having it disappear into the deep depths of the mind.
Now with PR, you blast the material into long term memory (sub con), use various activation techniques to build comprehension and recall. PR is about 'learning' the material and not memorizing it so that it becomes ingrained into the most important person ... you.