I came to Germany last month, I have a question will I be able to work 120 full days in this last month of the year? Nov/dec?

No, unfortunately you will not be able to work 120 full days in November/December. According to German immigration law, international students are not allowed to work more than 90 full days or 180 half days (each half day is 1-4 hours) a year. To qualify for the fulldays,you have to work at least 6 hours a day.