ALL THE QUESTIONS ARE THE SAME

That really depends on the jobs you are interviewing for. Are they all for the same type of job at the same company? Are they completely different jobs? In general you will prepare similarly for each one. The point of the interview is to sell yourself to the employer. You want to be prepared to give your qualifications and what would make you great for the job. You will also want to do a little research on each of the companies you are interviewing with. It goes a long way to know what they do there and what they might be working on currently. Be yourself and remember to smile and give the interviewer a firm handshake. Good luck!