Each preference is part of a dimension that consists of two polar opposite ways of thinking. Each of these opposites are useful and important mental functions. The skills of the polar opposites can be learned without requiring you to undergo a personality change. There are no good or bad types. The MBTI is not an intelligence test.
Type is only one of the ways of describing the dimensions of an individual's personality.
Obviously, there are many other descriptions of personality, none of which come close to a complete description of an individual. Your type is the starting line, not the finish line. The SuccessTypes program is based on the fact that a type description doesn't confine you to a given learning style. Type merely predicts the way you will learn if you have the freedom to choose. The problem is that different learning environments, different courses, different professors, and different types of evaluation all impose the need for you to learn in different ways.