I would spend the rest of the classtime testing their knowledge in creative ways. Organize your own retreat, with the help of the either teachers, and find games that either emphasize key concepts or test their knowledge.
Relay races where you have to answer questions, give the next line of a prayer etc. to advance.
We have a baptism water relay race that is very popular (fill paper cups with water from a pitcher using a plastic spoon), and similar games based on the signs and symbols of the sacraments.
Jeaparday where you use their vocabulary words
Holy-wood squares, where they answer true or false question, and take turns sitting in the square
crafts to enforce concepts–for our RCIA retreat tomorrow we are making Paschal candles for baptism, decorating wooden crosses from the dollar store, planting seeds for growth, making fruit salad for fruits of the Holy Spirit, and baking and eating bread for Eucharist. I use frozen roll dough which comes in little balls, thaws in an hour, they shape it into any symbol that has meaning for them, let rise about 20 minutes, bake according to package directions, serve with grape jelly.
for the second half of the year we have an “altar” set up for “Mass” in our assembly area, and each week spend time with the vessels, furnishings, vestments etc., then go through the parts of the Mass in detail, they take turns being priest, lector, server etc., also practicing posture, gestures, prayers, responses, and learning some of the hymns that are used in our parish.