PSU Exam (Public Sector Undertaking Exam) generally covers General Awareness, Current Affairs, English Language, Reasoning & Aptitude. Following are some tips which will help you in cracking the examination:

Be aware of exam pattern
Always make it a habit of referring to previous year question papers.
Concentrate also on general knowledge
Then quickly gather your thoughts. Be precise and sharp in your thoughts.
Avoid loose talks and stick to your point.
Be in control of the discussion but also give others a chance to contribute.
Use easy language that everyone can understand.