After learning so much, which software is the most important depends on the nature of your future work. If you are engaged in interior design in the future, mainly drawing construction drawings of interior design, then AutoCAD will be the main part, drawing CAD almost every day, and the other two softwares are basically not used. If you are engaged in the production of renderings in the future, then 3DS MAX is very important, because it accounts for more than 80% of your work. The finished drawings can be post-processed by PS, and CAD is not used much, mainly using 3D modeling. However, these are just software applications.
Let's take a look at non-software applications-practice.
In fact, this is the most critical part, that is, practice. No matter how good you learn software, it's useless not to practice it. It's not like graphic design. Graphic design is ok if the teacher takes it well. If you are engaged in interior design and drawing construction drawings in the future, you should first be familiar with the dimensions of various aspects of the building, such as wardrobes, shoe cabinets, suspended ceilings, light strips, TV cabinets and so on. And only when you are familiar with the size can you draw practical drawings; The second is to be familiar with decorative materials. If you don't even know the decorative materials, how can you draw? What materials do designers use to design, such as what kind of floor, what kind of material is used for ceiling, what kind of wallpaper is better for living room and so on. Thirdly, to be familiar with the construction technology, it is best to go to the construction site more and communicate with the workers more. Of course, you may not learn these things at school. You need to master the software before you have the opportunity to practice in a decoration company. It's good to have a design to take you there. It will get easier and easier after getting started.
Finally, if you have time, I hope you can read more books on interior design, such as Feng Shui, which can be applied in design. In this way, the drawings you design can communicate well with customers, and communication has basis and connotation. Finally, I wish you success in your studies!