OK. Don't be offended. This critique may sound a little rough, but it's how I see the situation.
If you break it down, it's pretty obvious that you didn't do your undergrad in engineering.
GENERAL subjects (math, stats, econ, chem, bio, ethics, computers): you correctly answered 61 of 84 for 73%. Not outstanding, but respectable. And definitely worth a passing grade.
ENGINEERING specific subjects (mechanics, materials, fluids, electrical, thermo): you correctly answered 29 of 96 for 30%. This shows a definite lack of understanding of fundamental engineering principles. Or, in the soft spoken heavily Asian accented words of the best professor I ever had, "Even if you do math all right... you get problem wrong... because, you don't understand concept."
I don't care how good you are at math. This is a timed test. And it is absolutely unforgiving to those that use extra time struggling to understand the problems because don't thoroughly understand the concepts. If you can convince yourself that a self-guided study regimen will give you the ability to look at any problem and understand what it's asking, what given information is extraneous, and what equations are necessary to solve it... all within the first read, and without flinching, then by all means skip the degree, get your nose to the grindstone, and start studying.
But, if you have any doubt, you probably would be better off starting that degree program now. There's a reason it typically takes a minimum of four years of studying their ***** off for most people to get a BS in engineering. And it's not because they just enjoy spending all their free time on campus. There's a lot of material covered in those four years; most of it building on concepts learned in previous classes. And remember, all the questions on the FE exam come from somewhere in that material. That's just simply way too much material to "cram" before the exam.
But only you know your abilities and your level of determination. Ultimately, it's a judgement call you'll have to make yourself.
