Need help for gate aerospace
 

I finished my degree in 2012..currently im doing some CFD Projects....But i i dont wanna do M.Tech in some non sense college....so i wanna crack GATE...But engineeering mathematics is the big deal for me...i have to prepare from start...so
syllabus are
Linear algebra
Calculus
Differential Calculus
Numerical Methods
..Help me how to start or where to start...im confused..everything looks new and big..Motivate me...