I don't see many Math questions in Abhilash's mock. Again, the best way to memorize the Math API is to write some code that uses it. It's worthless learning the Math API (as well as any other API) by heart like a poem. You have to know how to use it, and by coding you'll know, because at first, your code will contains errors and by repetitive API searching and documentation reading, you'll begin to see how the Math class is organized and why it is the way it is. You'll begin to see that what is in there is logically organized, and you'll make up a scenario that will help you memorize everything in there. Don't worry, you'll manage that
