Bootcamp has two types of TFE. The generator TFE and the practice exam TFE. The real exam is similar to the TFE found in the practice exams on bootcamp. The best way to master TFE is pick one of the two given sides, isolate a unique area, and then compare this area to the answer choices. After a lot of practice you realize that its just a bunch of motifs that repeat themselves, for example if you see two dashed lines running through the center of the figure its probably a circular tunnel, if its three lines then its probably a triangular tunnel.
Angle ranking is a real pain. 15 minutes is not enough time to master this section. You need to give it an hour. Maybe break it up into 15 minute intervals or else you will drive yourself crazy. I tried every method. I would up using a combination of all of them. I would use the answer choices and compare them vertically from left to right, only looking at one choice at a time. For example, if choice A is 4<2<3<1 and B is 3<1<2<4 and C is 4<2<1<3 and D is 4<1<2<3, I would first compare 4 to 3, if 3 wins, I have the answer, if not I compare 2 and 1 and so on. Eliminate answers using the strike-through feature on test day (bootcamp doesn't have this) To visualize, you can put a finger near the screen to make all of the sides of the angles the same length. You can also use the rapid look technique where you switch between staring at the vertexes of two of the angles rapidly. Another one is the hill method which talked about a lot in other posts. Personally I found that staring at the angles with my face close to the screen, then moving away from the screen and rapidly switching between them helped me a lot. And never compare more than two angles at a time. The best way is to use a bunch of these and see what works. I saved angels for last on test day because they are quick and you tend to waste time if you second guess yourself. This will screw you over for the other sections. Good luck!