Youve had nearly 2 years to make yourself a set of notes. If it was a niche subject, then you should have identified the textbooks you needed.
There are history books out there on Rome and Greece that just arent labeled for OCR. that is why you use the specification.
Unit A032: Option 1: The origins of Rome: The kings, 753–508 BC The set sources for this option are; Livy,
The History of Rome Preface; Livy,
The History of Rome 1.3-29, 1.39-40, 1.49-59; Virgil,
Aeneid Book 1, 1-11; Book 6, 752-859 and Book 8, 626-651. We have also translated Livy 1.1 – 1.2. This is not part of the sources set for this option, however it may be useful as background and context, and for this reason it has been included here. It is in italics to make clear that it is not part of the set sources. Candidates are only expected to have studied the set sources and are not required to study this extra section, though it may be useful as background and context.
There is no harm in asking, but when you do a niche subject you should know specialised resources are going to be rarer.