Holocron #4 Experience Point: It is an unmissable holocron. When you come across the circular walkway, it will be on a platform sticking out from the middle of it.
Holocron #3 Green Bacta Tank: Just after Holocron #2. It will be right after you Dash through the 3 flames in the hallway at the end of it. It is another unmissable holocron, meaning it will be hard to actually miss this one. Holocron #2 Saber Crystal: Just after Holocron #1. It will be right above where you need to Force Grip the platform to get across the gap. Holocron #1 Saber Crystal: Near the beginning.
