Do you believe that grades are a true reflection of intelligence?

I know alot of book smart people who cannot change their flat tire on their car. I call them idiots.

Absolutely not! There are so many factors that contribute to what grade you get and intelligence isnt really one of them. Its down to memory, how many of your lessons you go to, if you get on with your teacher, if you're a teacher is actually good or not, how you feel on the day/s of the exam/s, and (the one that I think is the most ridiculous) whether you can answer the questions the way the exam board wants you to. I remember in one of our mocks a boy in my class got every multiple choice question marked wrong because he put a tick in the box and you're meant to put a cross, so he probably got them all right - and in that subject there were a fair few multiple choice so it did affect the final mark by a lot - but nope, the exam board wanted crosses not ticks, so they were all marked as being wrong. And thats just one example from one subject...

Good God NO!!!!  Some of the dumbest people I know have degrees hanging on their wall.

No. If anything, it's a reflection of how that student responds to the methods used for grading.

Albert Einstein was a slow talker & slow learner. He hadn't much of good times in school. But you know what kind of things & researched he has done in science, right ?

So your answer would be clear by his example.

No .. It doesn't. The grading system that has been developed is simply a comparable means to 'grade' how a person answers a series of questions set as a standard that would comparatively indicate capacity for logic, abstract thought, understanding,
self-awareness, communication, learning, emotional knowledge, memory,
planning, creativity and problem solving.  Considering intelligence and the grading of it is not an exact science .. There are many factors that can affect the outcome of the testing procedures AND results.