There is an enormous Gap between what a student learns till Class 10^th and what he has to start learning in class 11^th. Due to this major chunk of those students, who start off their preparations after class 10^th, face difficulty to cope up with the challenges to be faced in 11^th. This is perhaps due to the voluminous syllabus in class 11^th compared to class 10^th. Best time to start preparation is from the beginning of class 9^th but in case you have not been able to do so, it is then wise to start your preparation just from the start of class 10^th.