When you are aiming for 100+, you aim at a perfect score of 120, you don't aim at 100+.

Lets break it down sectionwise:

READING:
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WHAT: 3-4 passages with 14 questions on each passage and you get about 20 minutes for each passage.
HOW:There is a pattern of how questions appear in TOEFL. Aim sequentially, don't get a question, move forward and review towards the end. Question in reading are generally asked passage wise so its wise to familiarize yourself with the types of questions. Remember keep moving forward, review towards the end, time is crucial in TOEFL. Do not spend more than 20 minutes on a passage(14 questions).