Please note that access to the Electronic version of the TEXTBOOKS is provided for a LIMITED PERIODequal to one calendar year, since each textbook is equivalent to one academic year of full-time study.
If you still don't have enough time, we'll extend your access for another six months for free.
If you need constant access to the materials you have already covered, you can always buy an excellent printed version of our textbook.
NOTA BENE: KEYS to the tasks at the end of each lesson (Check up) are FREE and can be found immediately after each Check’up.
KEYS to ALL EXERCISES in the textbook are purchased separately in electronic form and are presented in the next section.