Actually, mistakes are very important. You said that there are many special machine tools and grinders, so since you are a mold major, it will be better to be familiar with the basic processing methods such as grinder, milling machine, rocker arm, lathe and wire cutting, which will help you to consider the problems more comprehensively and accumulate experience in future design. If you have a mixed attitude, you will learn nothing. Starting from the grassroots level, the machinery industry is generally never too old to learn and speak frankly. Just graduated for a year.