how I can prepare the board exam of class 11th

Please go through our study material. All the topics are well explained with the help of videos and animations. Pick one chapter up for preparation and go through various concepts of it. Then go through the chapter test, generators, NCERT solutions and model test of that chapter. Learn theory and try to apply them. Likewise, prepare all the chapters. You have enough time. 

I​​​​​f you still face any difficulty, let us know.