Prediabetic and need to make a change

You still have a great chance to reverse this. Start with smart food choices: learn what a serving truly is/buy a food scale, stop for 3 seconds and consider what the food will do to you when you eat it.
Find an exercise you enjoy and stick to it.
A low carb way of eating could benefit you. Read up on it to see if it for you.
Sounds like you have a good plan in place with the prevention program. My only warning would be some of these things get off track where they start trying to have you consume powdered meals. If that happens: run. If they are teaching you how to truly eat properly then you have a legit program.

Low carb is the way to go. One week after eating low carb (30g a day or less net carbs) I was able to cut out half of my diabetes meds. Now 5 weeks in, I have cut out all diabetes meds. My blood sugars are normal every single time I test. And I routinely had levels in the 200's, 300's before. Good luck! My best advice is focus on it now versus waiting because you can reverse this.