Resources for learning classical Chinese
These two books have been recommended from another site (I haven't read these myself):

An Introduction to Literary Chinese: Revised Edition (Harvard East Asian Monographs) by Michael Anthony Fuller (2004)

A New Practical Primer of Literary Chinese (Harvard East Asian Monographs) by Paul F. Rouzer (2007)

Aside from learning yourself, another option is to find a Chinese person who did well in this subject to teach you or do language exchange.