[lucozade]

I'm going to assume you don't have anyone reporting to you. If you do then there'd be stuff to add to this.

Start with what you've accomplished since the last 1-to-1. Go onto things that you expected to accomplish but didn't. Explain why without griping.

Then go to what you're expecting to do by the next meeting. Highlight any concerns you have with achieving those things. If you have seen any issues that might get escalated, point them out. I prefer to know things that might go wrong and don't than be surprised by stuff.

Fundamentally, you should be letting your manager know what's going on and what might come up. BTW just because something is obvious to you, it doesn't follow that it's obvious to them. They can always tell you that they don't want to know about something.

Periodically, say every couple of months, ask for feedback on how you're doing, what you can do better etc.

If you have expectations for promotions, salary changes etc if can often be better not to wait for year end reviews. Even if your manager can't do anything with the info early, it's just another form of the no surprises rule.