Hello Chris, if you start from today onwards then also you can complete class 11th syllabus. But be focused , practice maths give atleast 5 hours to study (maybe more it depends) 2 hours on each subject. Why to think that if you can study from November or December you can start from now . See don't waste your time because in class 11 you have to study many new things like integration , differentiation, vectors then Physics and chemistry. If you begin to work from today onwards you will definitely score good in your school exams.

Hope you got the answer. Good luck !!