Like said above, what you should revise is WOW verbs with conjugations for multiple tenses and pronouns. You should also learn a variety of complex structures that you can easily adapt for different topics and questions. I also don't do Spanish, but I do French and German and completely understand the struggle you are going through. Spontaneous speaking is not easy at all, and with two weeks left to go, it won't be very easy to really improve the skills. Also learn IDIOMS. They really help differentiate you from the rest of the pile and impresses the markers.