Take classes
do not miss this step
do not be overconfident of doing it by yourself
all tha successful bunch have taken classes
by classes I do not mean coressospondence but teaching classes
always join brilliant tutorials as the second step
they have a cool corresspondence course
do not just join brillianttutorials without joining a class
get your basics clear
do not just solve a problem without knowing all the formulas
practice solved questions
why to solve unsolved questions when there are large number of books avaliable in the market containing solved
prepare a book containing all the formulas of physics, chemistry amd maths
eat, sleep and drink engineer entrance exam
work hard
do not take short cut
learn from cbse books
they are the best