Question about endorsements

I just got my CDL a permit and begin school in April. I pretty much have nothing to do until I start school, so is there any other endorsements I should get while I'm waiting just because? I've read a few people say get the tanker endorsement, few people said get the hazmat. If I'm not mistaken in my state it's only $6.50 per endorsement so I was considering getting a few more before I start.

Would multiple endorsements help me get a better first job? If so which should I get and how long do they last before I have to retake the test?