I am attending a partially funded MS in Applied Physics in the fall 2012 at a large research university. My BS was in Chemistry, emphasis in Chemical Physics, with research experience in materials science, though no publications, and industry experience at an pharmaceutical lab. The undergrad institution was also a large research university with a moderate-strong reputation in chemistry and physics. Sorry if this goes long, I just need advice, or maybe just to vent.
Originally, I was very confident about my ability to finish this MS with a high GPA and some publications, and move onto my PhD after gaining some experience. However, I am really starting to doubt myself now. Here's the thing: my GPA is very very weak with some terrible grades in important classes. That's because originally, I was a much less quantitative, much less rigorous major that found out that it just wasn't for me, and transferred late in the program so I had to cram classes. No excuses, I took some classes that were too hard for me at the time, too much pressure, habits not good enough, and just couldn't make it in some classes. Learned my lesson or so I thought. I'm just so thankful that I got into a MS program.
This year, I've been clawing my way back up slowly, with a 3.9 GPA in the first half in all upper division chemistry and physics classes taking a full load of classes while doing research. However, just a few weeks ago, I got shaken up badly by a terrible, terrible Quantum Mechanics test (the last of several midterms given before a comprehensive final). Previously, I had always scored a standard deviation above the mean, but on that exam, I suffered a total mental meltdown. If my score exceeded 20% for that one I'd be amazed. That shook me up going into the final, and though I'm much more confident in the final since I could answer every question and I checked my work to make sure it was reasonable for as many problems as possible, I'm scared, especially because the teacher gives very little partial credit.
In the fall I will be having all difficult core graduate classes, like math methods, quantum mechanics and classical mechanics. What do I do? The price for failure is much higher than in undergrad now, if I flunk out of this MS I will probably never have a chance like this again. I feel like a fake scientist that can't think quantitatively.
Is there anything I should be doing to increase my preparation? My current plan is to study like I was still in school over the summer and teach myself next year's classes in advance through doing hundreds of problems, but is that realistic? Has anyone tried that before? If so, what were your experiences? I don't think I'm mentally prepared either and don't know what to do really.