Saturday

I will make an Ielts exam tomorrow.I am going to Milano by train. I will start from my city at 6.00 a.m. and I will arrive to Milano at 7.00 a.m. I hope to reach my goal. I will have to be quiet to have a good result.

Tomorrow I am taking the IELTS exam. I will go to Milano by train, starting from my city at 6:00 a.m. and arriving in Milano at 7:00 a.m. I hope to reach my goal (of passing the exam). I will have to pay attention to have good results.

I don't think you really mean you have to "be quiet", since everyone has to be quiet while taking an exam! I just substituted "pay attention" because I think that may be what you intended. Hope you did well on the exam!