CCNA Discovery 4, Module 1 & 2, enough material for CCEN

Hello All, I have downloaded the CCNA Discovery 4 recently as I want gain a CCENT certification. My question is, Cisco states that the first 2 modules is sufficient enough to sit the CCENT certification exam, is this true? I have bought the companion guides for the first 2 modules but am feeling a little un-sure if the material is sufficient. Can someone who has used the CCNA Discovery study method please shed some light if the material is sufficient enough.

P.S. I must say reading some of the post and replies from the CCNA and beyond certified here is a real confidence boost.