Do I need to take the SAT ?
Yes, you will have to the SAT Reasoning Test (or the ACT plus Writing). SAT Subject Tests are recommended too. The TOEFL or IELTS is required if you were not instructed in an English-speaking school. You can find the application instructions here: International Students - UCLA Undergraduate Admissions
A couple of data points you might be interested in. In 2009 (the most recent year available in the UC Stat Finder
), the average international admitted student had an unweighted GPA of 3.79 and an average SAT score of 2126 (out of 2400). According to WES' grade conversion guide, French grades from 14-20 should be considered an A. See here: WES Grade Conversion Guide