The co-op Search

Alright ... for those of you unfamiliar with how finding a co-op job works:

1: I have to read through descriptions of jobs. There are 550 for Mechanicals to apply for through an online site used by UC called place pro.
2: I have to search through these 550 jobs and pick out up to 20 to apply to.
-I searched using keywords to narrow down to more around what I might be willing to work with.
3: I have to pick these jobs (normally only 12 to 15) and rate them 'very high' so the company gets my resume.
4: The company then has to contact me for an interview or other information.
5: I have to go through the interview process.
6: I have to be offered a job. This is the point where I have the opportunity to be a bit more picky about which job I would prefer over the other.

So basically ... the jobs I listed in the previous post are jobs I would be willing or have already applied for. I need to pick about 10 more. Ideas? Either on search keywords or which of the following I should rank 'very high'. I have already applied to NASA and Lockheed Martin. Both are high on my want list!