The development of embedded software has recently been increasing among many companies. This situation carries the need for training of more embedded software engineers. The Nagoya University provides reeducation of embedded software engineers in the working world. We divide the engineer into four classes by technical capabilities and a career. We developed nine educational courses. These extension courses are short intensive courses on training embedded software engineers. The manager is demanding not only theory but skill training strongly in a subordinate's education. We are tackling many exercises, in order to improve an embedded software engineer's skill. We record the number of times of key operation which students performs into exercises, and analyze exercises.