Accuracy of a model?

I created this model to diagnose Parkinson’s: gianlab/swin-tiny-patch4-window7-224-finetuned-parkinson-classification · Hugging Face. In the model I used 20 epochs but at the twelfth epoch I obtained the maximum accuracy of 90%, while at the twentieth epoch an accuracy of 63.4%. Is the model accuracy 90 or 63.4?