have look at CAREEREDGE model and the profile that is constructed based on this model.

other scales are for measuring perceived employability or they are for employees.

http://www.google.com/url?sa=t&rct=j&q=career%20edge%20model&source=web&cd=2&cad=rja&ved=0CDIQFjAB&url=http%3A%2F%2Fwww.heacademy.ac.uk%2Fassets%2Fdocuments%2Fseminars%2Fthemes%2FTWO63-Presentation-by-L-DacrePool.ppt&ei=8tTLUseAKcaMrQeHqoEI&usg=AFQjCNH-2Git0aq4StcLq0365VWN9QVT4w&sig2=B25U0jwJ6zd8vzDQ_FbYbQ&bvm=bv.58187178,d.bmk

May I know what do you mean by students' employability efforts? Is it efforts by students to get employed or students' efforts to boost their employability or efforts by employers to hire students?

Students' employability efforts will essentially look at their job seeking behaviours.

Job search behaviour is a multidimensional construct and it focuses on use of job sources, job search intensity, or specific job search behaviours (Blau, 1993).

A few resources. First:

Second:

Third:

I used a measure designed by Strauss and colleagues in my research on student employability.  It measures four behaviours: career planning, career consultation, skill development, and network building.  I also included a measure of self-perceived employability.  At the risk of self-promotion, I'm attaching a copy of my article so you can see the full set of measures I used.

Article Understanding students’ motivation towards proactive career ...