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Hi,
could you please correct my mistakes? Thanks a lot!

Good morning
As a topic for my oral exam I have chosen chapter number 1,which is The hosiptal team. Now I would like to tell you in a few minutes what this chapter is about. I am going to talk about the hospital staff as well as wards in a hospital and also about nurse´s job.
A hospital is divided into wards in which works the staff who specialize in various fields.
All those workers must be fully-qualified,otherwise they have to take courses.
There is a reception usually standing next to the entrance where works a receptionist who responds to emergencies and gives first aid. He can help you find a cardiologist,paeditrician,physioteraphist,radiologist etc. He should give you every information about what is going on in the hospital. Or if you have come to apply for a job,he will send you to a personal ward.
Another person working in a hospital is called a pharmacist. Pharmacist prepares medicines to give to medical staff or patients. He can prepare a medicine for almost every disease. Today we have a huge amount of medicaments so the pharmacist has to be well aware of what type of medicine he sells and also a contraindication of medicaments.
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I have underlined some problem areas and stricken out unnecessary verbiage:

Good morning. As a topic for my oral exam I have chosen chapter number 1,which is The hosiptal team. Now I would like to tell you in a few minutes what this chapter is about. I am going to talk about the hospital staff as well as wards in a hospital and also about nurse´s job.

A hospital is divided into wards in which works the staff who specialize in various fields. All those workers must be fully-qualified, otherwise they have to take courses. There is a reception usually standing next to the entrance where works a receptionist who responds to emergencies and gives first aid. He can help you find a cardiologist, paeditrician, physioteraphist, radiologist, etc. He should give you every information about what is going on in the hospital. Or if you have come to apply for a job, he will send you to a personal ward.

Another person working in a hospital is called a pharmacist. Pharmacist prepares medicines to give to medical staff or patients. He can prepare a medicine for almost every disease. Today we have a huge amount of medicaments, so the pharmacist has to be well aware of what type of medicine he sells and also a contraindication of medicaments.
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Hello MM,thank you a lot for your correction,appreciate it!
But I am wondering why you underlined these two:

A hospital is divided into wards in which works the staff who specialize in various fields.
There is a reception usually standing next to the entrance where works a receptionist who responds to emergencies and gives first aid.

What is wrong with them? Thank you a lot in advance!
A hospital is divided into wards in which work the staff who specialize in various fields.
There is a reception area usually standing next to the entrance where a receptionist responds to emergencies and gives first aid.