Could you help to correct my mistakes, please?

Hello, everybody. I'm asking for help. Here is my translation of one text. Could you please help me to correct my mistakes, please?
Thank you in advance.

About eExams (1st part)

1. The better (or you could use 'more' depending on the context) you study, the far more likely to you will get hired.
2. High grades demonstrate exemplifyies that, you can study to your heart's content, your heart out (do do one's very best\to go to the utmost\to the fullest extent of\push oneself to the limit\to go all out\ to work one's tail off), concentrate on the subject, and set and reach (or attain) your goals.
3. All this, undoubtedly, plays a role in the hiring. (or '...the hiring process')
4. The aforementioned above facts (above-mentioned facts) are particularly important when companies are offering fewer and fewer jobs for unskilled workers.
5. You should be self-confident and proud of your erudition. (Great use of 'erudition')
6. You should ignore advices of from not serious (facetious/frivolous--unsure the context) persons (people).

Great work on these concepts and expressions!