"Can the high school diploma of Huangguoshu Waterfall be discounted for college entrance examination? If so, how much can it be knocked off and what are some ways to use it?"

There are discounts oh, from June 16th to August 31st of the year 2023, discount scenic areas include Huangguoshu Scenic Area, Longgang Scenic Area, and Tianlongtan.
Note: The translation is literal, and the sentence may not make complete sense in English.
There are offers, from June 16th to August 31st, 2023. The offered scenic spots include Huangguoshu Scenic Area, Longgang Scenic Area, and Tianlongtan Scenic Spot.
You can look up his official WeChat ID.

(Note: “他的” is a possessive pronoun, so “his official WeChat ID”)