Although he studied hard, he couldn’t succeed . . . . . . . . getting a high score in his test A. in B. upon C. at D. to

The correct answer is D. to.

The preposition “to” is used to indicate a goal or destination. In this case, the goal is to get a high score on the test. The other prepositions are not as appropriate in this context.

• The preposition “in” is used to indicate a location or position. For example, “He studied in the library.”
• The preposition “upon” is used to indicate a time or occasion. For example, “He arrived upon my arrival.”
• The preposition “at” is used to indicate a point in time
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  or space. For example, “He arrived at 10:00 AM.”

I hope this helps! Let me know if you have any other questions.