It is normal for the First day of class there is some confusion. Maybe we don't know which classroom we have to go to, who will be our new friends, or what tutor we will have. First of all, don't worry. We have all had these kinds of doubts and they have solutions. You will only have to inform yourself in the corresponding place.
When you arrive at the educational center on the first day, you may not know what class or group you belong to. These types of centers usually put some lists on the notice board where all the students are listed. In this way, you will only have to go to them and find your name and surname. The question will be resolved automatically as soon as you read the details on your file.
The next thing is to enter the facilities and find the class that has been indicated to you. It is not difficult, since these are usually numbered following a logical sequence. In the event that you get lost, you can ask any of the teachers or managers you meet (there are usually a lot of people, especially that day)
Finally, you will already be in the class that corresponds to you. From here, it will be the tutor or teacher in charge who will give you the rest instructions, such as the place where you sit, the materials you have to buy, etc. It could be said, in quotes, that you have started the day on the right foot. You just need to start to settle into your new position and study everything you need to get the best possible grades.