This is the 11811th most frequent Spanish word.
hacerla
"To succeed" or "to make it."
In this sentence, "hiciera la" (third person subjunctive of "hacer") is used to explain the action of doing.
Me pidieron que hiciera la presentación para el grupo.
They asked me to do the presentation for the group.
Here, "hacerla" refers to succeeding or performing successfully in an exam, a colloquial usage.
Si estudias mucho, podrás hacerla en el examen final.
If you study a lot, you will be able to ace it in the final exam.
In this construction, "hacerla" means to make something in a certain way, where "la" refers to the object being transformed.