I am yet to get a bounce high enough to reach second boost, but I believe it may be possible with enough speed going into it and getting lucky on the bounces.

You do this by just taking as much speed into it as possible and going head first into the corner as low as possible, then turning left while busy bonking to point upwards.

Unfortunately, I've never ran this game and do not have a capture card, however I did find a skip that may be useful to you. In the last room with the three windows needing to be shot out, if you stick to the bottom of the elevator and move along once it gets right to the bottom, you'll clip through the floor a little and get pushed all the way to the right and out of the room, completely skipping that room. The camera will follow you, too.

Something I've realised that's happened multiple times to me on this map is that I go through the checkpoint/finish line and it doesn't count you as having gone through. I think that the line doesn't extend all the way to the wall, so if you're too close to the wall, you end up passing around the track line instead of through. However, as I'm writing this, I've just had the thought that if you do get this, you could possibly turn around, go back through the line, then turn around again to skip an entire lap.