If you are good in Maths, Science, History then CGL & WBCS are not tough to crack for you. CGL exam more or less depends upon a lot of practice where as WBCS depends upon your memory & writing skills.

CGL exam consist a tough level of Math as well as its English completely depends upon grammar & vocabulary. But in case of WBCS you have to study a number of subjects like History, Geography, Math, English etc. also. Banking exams are not very tough but the time limit and format of these make it little confusing. Banking exams are more about smartly approaching the questions & The various sections of the exam is quantitative aptitude, reasoning, english, computers and general awareness. All the exams are easy if you do the hard work to crack the exams with the positive attitude.

Good Luck!