Here you have some links to practice for your exam! Come on, don’t be lazy!

PRACTICE with CAN
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/sharing/canandsimple-present.htm

PRACTICE CAN (Present) and COULD (Past)
http://pagesperso-orange.fr/absolutenglish-972/notes/inventions/robotschores.htm

HAVE TO, MUST, MUST NOT quiz
http://www.englishclub.com/grammar/verbs-modals-have-to-must-not-quiz.htm

MUST / HAVE TO
http://www.englishpage.com/modals/interactivemodal2.htm

WHAT MUSTN’T YOU DO AT SCHOOL?
http://s.mound.free.fr/skyblues67/modals/mustn%27t.htm

and…
http://www.edu365.cat/eso/muds/angles/can/index.htm