Roy Sorensen offers the follow description of vagueness:
Vagueness is standardly defined as the possession of borderline cases. For example, ‘tall’ is vague because a man who is 1.8 meters in height is neither clearly tall nor clearly non-tall. No amount of conceptual analysis or empirical investigation can settle whether a 1.8 meter man is tall.
He attempts to distinguish between vagueness and ambiguity:
Words are only vague indirectly, by virtue of having a sense that is vague. In contrast, an ambiguous word bears its ambiguity directly—simply in virtue of having multiple meanings.
This contrast between vagueness and ambiguity is obscured by the fact that most words are both vague and ambiguous.
Even languages can be considered vague and ambiguous:
Every natural language is both vague and ambiguous. However, both features seem eliminable. Indeed, both are eliminated in miniature languages such as checkers notation, computer programming languages, and mathematical descriptions.
Even the word "vague" itself is vague. So one can expect the terms under consideration: "proper education", "real world education" and "successful life" to be both vague and ambiguous. That is, they all possess a sense in which there is no precise borderline allowing one to determine when something has the predicate or not and one can imagine multiple meanings of the terms that would suggest ambiguity.
The OP notes that all three terms can have multiple meanings. This is what would make them ambiguous. The question is whether they are vague.
If there is a borderline case that makes it difficult to determine if that case has or does not have the predicate, then the predicate is vague. For "proper education" consider the case of someone who has finished a junior level at a high school. If they have a proper education they should not need to continue to senior level to get a proper education. For "real world education" consider someone who has one year experience working at a job. Do they need another year of work experience to have real world education? For "successful life" consider someone who feels they are happy and they have $100 worth of savings. Do they need to have more money to have a successful life. Do they need a different sense of happiness for a successful life?
Since "most words are both vague and ambiguous" it should be easy to find both borderline cases and multiple meanings for them.
Sorensen, Roy, "Vagueness", The Stanford Encyclopedia of Philosophy (Summer 2018 Edition), Edward N. Zalta (ed.), URL = https://plato.stanford.edu/archives/sum2018/entries/vagueness/.