"The way you feel about your preparation is as important a factor as the actual preparation. Some people do reasonably well with no preparation time. But the vast majority do better when they've had time to prepare. "
"When presenting our case, every person – every company – must be clear on all the key selling points around what they have to offer. These key points are like aces in a card game. You need them to win."
Sequential learning in class or on-line has significant drawbacks. You are either forced to go through the basics once more, before finding anything of real value or interest. Or the instructor-led process tries to satisfy too broad a range of the audience to make anybody happy. In either case, you may end up with that distinct feeling of having just wasted a significant amount of time.