While the home study is beneficial, as it is, the issue is there is no specific level of knowledge that you can demonstrate to other people. Another aspect of home study that is difficult to define for others is that everyone's concept of "home study" differs.
You may study for at least a couple of hours during the weekend and declare that you are an avid wine drinker as compared to someone who may be studying for just a few hours per day. There's no distinction between studying at home and what's happening. You can find the best online Wset wine courses through various online websites to get expertise in the wine industry.
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Here few points to prepare more efficiently for the wset level 3 exam.
1. Evidence of a specified knowledge degree
If you're telling someone that you're a wine expert, they'll be interested in knowing what degree of expertise you possess. As you mentioned that home study is recommended and encouraged, this is the point where WSET certifications are needed.
An award from WSET whether at Level 1 ,2, 3, or Diploma, shows other people that you have achieved the required level of expertise regarding wine.
The things you could do!
The professional certifications you earn can open possibilities for careers that you didn't think of. If you're just beginning your journey in the industry of wine, or even pursuing wine as a secondary career the certifications you earn will allow you to distinguish yourself from others.