Once you play through the stages enough, you start to see patterns of repetition. (Certain spellcards always killing you, near-exact place of death on said spellcards, etc.)
I say memorization is the key to victory. Unless you have short-term memory, in which you just bomb through the things you have trouble with. Deathbombing isn't bad, it is just hard to predict when you are going to get hit most of the time, which is why it really isn't recommended unless you have uber, uber, reflexes. (The small window you get to deathbomb in PCB is far too small for slow players like me.)