Welcome to my world. I have midterms and finals and I took all the provincial exams before. Most likely, your state exams will not be way harder than your school midterms and finals, so just study and you'll get it done when you get it done.
No need to apologise. If you want to go to college and do well, you have to do a lot of hard work and the work load will increase. Third Level Education is completely different ball game from Second Level. =S
California instituted a standardized test that high school students had to pass in order to graduate quite a few years ago (I think I took it as a sophomore, in 2003 or 2004). Any 8th grade student in my district should have been able to pass it easily, but apparently there were students throughout the state that were repeatedly failing it (and, even worse, in my high school). Also... it only tested math and English.