Judith's 4th grade class has a spelling list organized by subject. The spelling list includes 120 words about history, 115 words about science, 70 words about math, and 45 words about geography. Each week, Judith's teacher tests her on 15 words from the list. Judith's class has already had 6 weeks of spelling tests. How many more words will Judith be tested on before the end of the year?