Cracking placement exams is not such a big deal…
At first you have to desired your field whether it is core or non core company.
After that, try to analyse the syllabus pattern of your desired field.(taking 1–2 days)
Just visit your college library and do some research about what are the various Aptitude and reasoning books are available for your desired field in your college library.(taking 1 day)
Select a suitable book and do some regular effort.(approximatly 2monts=60days=minimum 6hrs per day=360hrs)
If you cover 20 questions in 1hr then you must reach 7200 questions in 360hrs
Just input your hardwork and
get output of your success