Hii!
Frankly speaking, no you can't. Starting from scratch, with 3 hours a day, you cannot crack jee Mains so easily. You need a proper routine to study wherein, you should grasp and know all the basic concepts, the types of questions possible, etc., So, this takes time and if you try, it will become hectic for you. Definitely 3 hours a day will not work, you will have to dedicate more time. And yes, instead of hard work, focus on smart work. At this point, what you can do is, solve as many previous year question papers as you can. This will help you get an idea of the way and type of questions asked in the exam, the difficulty level and the time consumed by you to solve them. This way, you may qualify the exam, if you practice seriously with previous year question papers.
Books, for physics, - SL ARORA, HC VERMA
Chemistry - Dinesh publication, Modern's ABC
Maths - Arihant mathematics, cengage etc.,
And offcourse NCERT of all subjects.
Hope this helps.
Good luck!

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