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I am not sure how many K you are concerning about. My feeling right now is that I am not sure it is worth all my effort doing all those things. I feel really old now. Stress and pressure I have gone through the whole process put me in a very unhappily spot of my life for such a long time. I wasted my years of happiness and I don't know how long I can live to pursue my career. People came from different cultures to America. It is sometimes hard to understand and accept people from different cultures when some behaviors are not acceptable in my culture but I may have to deal with it. Or else, I have to withdraw myself out of that environment. Be prepared for that "trade-off" as well. Be open-minded. TOEFL is one of the test for you to deal with that when you have to deal with the test centers and other test takers.
I hope that everyone has good experience at your work. Don't be the one who makes everybody stay away from you yourself.