Cpt

For the quantitative part, if you know Additions, subtractions, multiplications and divisions, you are good to go! I am pretty sure you knew them. Just learn the basics and basic techniques in each and PRACTICE PROBLEMS A LOT! Aptitude is all about how you apply your brain and logic, not mere mathematics. One book I suggest is "Quicker Maths" 

Prepare those chapters in Quantitative Aptitude
• Ratio and Proportion, Indices, Logarithms
• Equations
• Simple and Compound Interest
• Sequence and Series
• Measures of Central Tendency and Dispersion
• Index Numbers
• Probability

For Maths take help from your school friends. You just need to score 15 marks to clear this exam but work hard in others subjects

​