Probably not a lot I can offer comment to due to the lack of specific detail. However, a thought or two ...
I had about 8 or 9 chart questions - ranging between 2 and 3 marks each.
Money for jam in the exam IF one is right up to speed with how to do the sort of questions usually asked. Back to the books and a lot more speed and accuracy practice workup before the next exam attempt.
I was also very nervous
Happens to the best at times. Unfortunately, for a pilot, you MUST manage external stressors so that you can still function and get the job done. You can't just pull over to the side of the road as you might in a car. The trick now is just to get back up on the horse and have another go at the jump.
because it was the 'most right' sounding answer.
Some points of technique
For multichoice, suggest you
(a) look first for the wrong, or not quite right, answers and note them for they are to be rejected.
(b) with luck, you might end up with only one remaining ... that makes your job so much easier.
(c) if you don't select an answer, you don't get any marks for that question. If you select a wrong answer, you don't get any marks for that question.
(d) it follows that, if you absolutely can't figure out the question and answers, then you have a guess and cross your fingers that your guess is correct. It follows, further, that it you have eliminated the odd answer, as above, you chances with a guess get better.
if VToss for a heavy aircraft is at a certain speed, how would it change for a lighter aircraft
Providing that the chart isn't based on a constant takeoff speed, then you should see a scale indicating that the speed increases with weight. Caveat, this applies for weights where the Vmc considerations are less that the stall concerns. At very low weights you might be Vmc limited and see a constant safety speed. If you are stall limited, then the speed will increase with weight.
Also be mindful, one of the PNR's you had an ETAS. So remember to check that.
ETAS is ONLY relevant for the CR nav triangle solutions and of NO relevance to the Dalton. There should not be any reference to ETAS. Perhaps you can give us a bit more detail on what the question had to say on ETAS so we can offer a more specific comment ?
I was so confused as to if this was a forward limit issue or a rear limit issue.
This should be easy to resolve. First, figure a starting configuration load weight and CG. Plot it. Observe whether you are closer to the aft limit or the forward limit. Proceed accordingly.