A single switch unit having a pair of switches is provided in the vicinity of a throttle grip which is provided in a distal end of a tiller handle. It comprises a signal generation circuit generating an oscillation signal in accordance with an output load. A computerized system analyzes Meta-Data associated with the Tests, Questions and the learnerstudent response to those and provides information which helps the learnerstudent learn faster, get a deeper understanding of the subject area and helps them focus and practice for the subject area of needs. A pointer at a later time is compared with the pointers saved at the earlier time.