IMPORTANT BOOKS FOR SSC CHSL
MATHS --- M. TYRA
REASONING --- R.S. AGGARWAL
G.K. ----- LUCENT'S
ENGLISH ----- R.S. AGGARWAL
Special tip for math preparation
for maths you have to practice and practice and practice a lot.
do all type of questions of each category and make your speed (speed matters)
M. TYRA is the best book till date.