What you need is the reply I provided. Did you try it. What is the name of your table.
Assuming your Dropdown1 items is:
Table1.Question where you would be selecting the questions,
In the Default of another Textbox, put;
LookUp(Table1, Question=Dropdown1.Selected.Value, Previous Year Score')
Or
LookUp(Table1, Question=Dropdown1.Selected.Question, 'Previous Year Score')
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