You should have studied English and mathematics at the intermediate level. There should be an understanding and awareness of current affairs. Ability to analyse and interpret information given will help in the reasoning section.
Basic knowledge of mathematics, especially what you have read in Class 10 and 12, will help you sail through quantitative aptitude. Reading newspapers, magazines and watching news is a great help in cracking the general awareness section.
The marking scheme for the BBE entrance exam is as follows: +3 marks for every correct answer and -1 for every wrong one. The questions left unanswered will be marked as 0 while questions answered with multiple answers will be marked as invalid answers. Hope this helps. 🙂