Let me make sure I understand. You have trained a classifier with one data set, but no longer have access to that SFrame. You would like to evaluate the classifier's performance on a different data set. What version of GraphLab Create are you using? What kind of classifier is it? You can get a list of column names that were used as features to train the model with the model's get method:
Similarly, you can get the name of the column used as the target label with the get method:
Once you have those, you'll want to make sure that you have the corresponding columns in your test set. Then you evaluate your model on your test set using the model's evaluate method:
Be warned: if you can't perform identical feature engineering steps on your test data (because you don't know what those steps were at training time), you may find that the classifier doesn't perform as well as it should on your test data.