I took the Kayten course [1] to review for the Patent Bar exam. It was three days, and then I spent a couple months reviewing all the old exam questions.
Note that the patent bar exam tests you on knowledge of rules and regulations of the patent office and of the Patent Cooperation Treaty that many countries have signed on to. So you won't necessarily learn to draft a patent or how to read a patent just by studying materials for the patent bar exam.
True. Like anything, you only learn the REAL practice of it by doing it. In my case, I found a lawyer who made a practice of taking novices & training them (then they'd eventually go on to higher-paying jobs).