Don't be worried......Yes u have less time but not so less that u can't cope up......U have to work hard and really hard if u start now.....Focus on what u have to study and plan out the study so that u know what to complete by when ......Only then u can complete your syllabus in proper time..... Waise maine bhi Sept Oct ke aaspass shooru se start kiya tha....But today I am well in pace in class XII..... So don't worry....Just remain determined , work hard...Set difficlut targets and try to achieve them.......BEST OF LUCK...... Cheers!!!!!