Prefixes that change the meaning:
* Pre-read: To read something before it is officially released or published.
* Re-read: To read something again.
* Mis-read: To read something incorrectly.
* Over-read: To read something excessively.
* Under-read: To not read enough of something.
* Un-read: Not yet read.
Prefixes that create a new word:
* Reader: A person who reads.
* Readibility: The quality of being easy to read and understand.
* Reading: The act of reading.
* Readily: Easily or quickly.
You can also add prefixes like "bi-", "multi-", "tri-", etc., to indicate multiple readings, as in "bi-reading" (reading two things at once).
The best prefix to use will depend on the specific context you need.