This kind of mistakes would make you miss out questions.
This kind of weakness would make you miss out questions as well.
The second sentence would focus on the fact you keep making mistakes on a kind of subject (content weakness).
The first one is in a more general way, but it could be (for the sake of illustration) referring to the "habit" of missing the word "except" OR "least" or other kinds of "catch-word". So, we are talking about careless errors, a major mistake from lack of attention (or even by pressure - perhaps for not allocating time accordingly).