Jepp publishes a small instructional booklet of 20 or 30 pages that covers most every detail that can possibly be found on any plate or chart they publish. Can’t remember the exact cost, but it is somewhere in the $5-$10 range. Well worth it, as there is a lot of nuance in the various diagrams they use, the font, color, broken vs. solid lines, etc., and their meanings. This thing covers anything you will ne asked in an interview. Read it and practice a basic approach briefing as others have recommended.

Edit: Just found it -https://www.amazon.com/Introduction-Jeppesen-Navigation-Charts-10011898/dp/B01K0L26OG/ref=mp_s_a_1_1?ie=UTF8&qid=1546921792&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=jeppesen+chart+g uide&dpPl=1&dpID=41UMviPGg3L&ref=plSrch