Before revision:  Although it is natural to pre-train  interactive features available in large amount, narrowing down the prediction targets to assessments holds relevance to the label-scarce educational problems while reducing irrelevant noises.
After revision:  Although it is natural to pre-train interactive features available in large amount, narrowing down the prediction targets to assessments focuses the tasks' relevance to the label-scarce educational problems while reducing irrelevant noises.