I would like to search first my notes (.tex).
How can you set priority to tex -files in Spotlight search?
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It seems that you can't do that in Spotlight preferences.
What you could do is reorder categories by drag and drop in the 'Search Results' tab inside Spotlight's preferences. You could also disable (uncheck) categories you don't want to like 'Applications','Suggestions'…
An alternative solution is :
From the finder you could also do more quickly a search with two criteria :
Here's an article about custom search in finder.