My test scores oscillate between T and F, but I'm totally sure that my main function is Feeling. The main factor for my decisions have been my feelings towards myself and people, whether be anger, happiness, sadness, etc... all of them arised by some value or very personal and subjective point of view. It also comes from my desire to understand others' personal point of view, so we can make a consensus to do what's good for everyone and me.
Ultimately, I've been finishing my last grade of high school, which comes with tons of group homeworks, expositions, and a social project that I'm doing with 2 more friends so I graduate from school. This has definately grown several traits that are associated with the Thinking function, particularly Te, such as management, planning, a practical mind, good observation skills, time and resources management, organization of people and stablishing their responsabilities and bondaries. I've also developed some of the negative traits of Te, such as some unpatience, control freakness, and a somewhat dominating personality.
However, I know these traits haven't been all the time in me, they have been developed because of the necessity to respond to the situations I face. That still doesn't mean I've lost traits of my Fe, they still stay in me, together with my grown Te.
The point is that tests just measure in base of the questions it asks. It doesn't consider your past, your background and the situations you face now which may develop your other functions. Some are a little bit superficial, the questions don't get into the test taker's motivations, decision ways, etc... You keep your main functions, but the others will develop in base of the situations you have in life. That's why you have to think very well of the results you have, compare it with the other functions and your reality.