> In general, research does support the benefits of mentoring — when it’s done well. When graduates had mentors in college who helped them pursue their goals and dreams, they were 1.9 times more likely to say that they were engaged at work, according to the 2015 Gallup-Purdue Index. Other research has found links between formal mentoring programs and both academic and professional success.
Good mentoring also has positive effects on mentee attitudes. But if the mentee isn’t satisfied with the relationship — if the mentoring is low quality — those effects don’t show up.(Source)