<p>Here are my thoughts. If you studied physics in undergrad, and were considering doing some kind of engineering in graduate school, I’d consider beefing up the engineering resume and perhaps trying luck there (you say theoretical courses were not your cup of tea). I do not think a low GPA in theoretical courses will kill you if you’re applying to a different program.</p>
<p>That said, you need to plan on serious preparation in the things you actually want to do graduate studies in. Engineering programs seem to be more forgiving on GPA than say, a theoretical physics program might be. The flip side is that those programs may almost expect strong letters from someone you did research with. </p>
<p>If the programs actually accept the mathematics or physics GREs, then sure, you can try them (this is only if the programs are actually suggesting those as possible things you can submit - else, don’t waste your time!). Further, only submit scores if you actually do very well. Nothing is a substitute for some (demonstrated) solid success both in fundamentals required for your discipline and strong letters from people whose words are well-respected.</p>
<p>I think juillet’s last paragraph is what I would advocate, if I were to vouch for an actual plan.</p>