[QUOTE=prex8390;2425888 The people I have seen to struggle the most are guys who got their ratings in the 80s/90s. Made a life outside of flying and then come back to it now trying to catch the hiring wave, maybe doing a neighbors BFR or a few IPCs throughout the years and can't keep up with the pace of 121 ground school. [/QUOTE]

Hey, I learned in the early 90s and I did just fine.

The weakest point has been basic instrument flying and understanding the complete arc of an IFR flight from gate to gate. It's not really the plane but what should you be doing in the next 20 minutes.

Anticipation.

If you have been out of flying for a while, consider flying a few flights under IFR (doesn't have to be simulated/actual). Overplan and overbrief. Flying the plane is easy, managing the flight is where people get overwhelmed. Practice thinking ahead.

Also, re-read the AIM before you start class it will help fill in some gaps or wake up dormant knowledge that will help internalize what you will learn in Indoc.

If you are coming from light aircraft GA, you will find a lot of that stuff that really didn't apply, suddenly does. Example: You will start to see airport markings you have only seen in the book. Do you know the +/- mach speed you can deviate from assigned before you have to inform ATC? That kind of stuff.

They will tell you in class what specifically you will be tested on, but all this other stuff will serve you well as base knowledge in training and on the line.