Edexcel C3,C4 June 2013 Thread

Yeah that makes perfect sense. I really want to do well in this module in terms of predictions and not having to retake. If I master the edexcel papers so far, will that suffice? That was my only concern when I saw how people are tackling Solomon etc. I mean my initial plan was to make sure Edexcel papers I'm comfortable with and then having a look at some interesting Solomon questions, not really do Solomon as a strict paper as such

But you don't have physics exam, so you are way more luckier.

There really isn't that much difference between Solomon papers and normal papers. Occasionally, there are a few difficult questions in Solomon papers, but then the same can be said for edexcel papers. I think that mastering the edexcel papers will be enough. The worst case scenario will be that a difficult question comes up that you can't answer. But then if this happens, the likelihood is that a large number of other candidates won't be able to answer it as well and so the grade boundaries will be adjusted accordingly. So as long as you can still answer all the normal questions, you'll still be able to get an A*.

just part a, I don't really get the wording, i got the easy bit dx/dt = kx(1-x)


it says 1/4 of the crop is destroyed when the plague is located,

so i thought when t = y say, x = 1/4, and if the crop is destroyed in a further six hours, t=y+6 and x =1, i'm confused.

$\dfrac{dx}{dt} \propto x(1-x)$

$\dfrac{dx}{dt} = kx(1-x)$

1/4 of the crop is destroyed so far. It says that if the rate of change remains constant, it'll be completely destroyed in 6 hours.

There's 3/4 of the crop left.

So $\dfrac{dx}{dt} = \dfrac{\frac{3}{4}}{6} = \dfrac{1}{8}$

and x=3/4 obviously. So sub those two values in to find k.

Thanks that will be brill Do you find elmwood papers to be useful?

Why not as this is clearly just application of knowledge and seeing if you truly understand the content and not just learning a set routine to get a grade.

here's another question like it ...

Yes it's been asked as part of a Solomon, however nothing in any text book asks you to do this. Application of knowledge however I wouldn't expect them to go this far

I'm doing the same really, only done like 2-3 past papers so Thursday could be rather interesting, but I'm confident on getting 90+%

I wouldn't put it past them really as they're trying anything they can to separate the top students from the rest and this is what will do it really

so in 6 more hours, 3/4 of the crop will be destoryed and that will resemble the rate of change?

Have you had a chance to look at the AQA c4 paper from yesterday? Few friends said it was horrible and I haven't seen it

Where are you finding these questions from exactly? They're not too hard, just time consuming really

Animal. I've done all the Solomon and 2007 Papers for C4.

And I did all Solomon and the real papers for C3. In the 2009-2013 C3, my lowest score was 72/75.

Think I will do C4 papers tomorrow; I just need my brain to be in the state of mind of doing new questions so may do 2008/2009 C4 Papers tomorrow before the C3 Exam, and then just flip through my C3 papers.

I'm learning that on the Papers I scored very well in I was just in a "Problem Solving State of Mind", where my thoughts were just flowing continuously.

Hopefully I can get all the C4 Papers done by Saturday, all Chem 4 done by Sunday and all Phys 4 done by Friday evening. Then have 2-3 days just re-doing.

like i said, they are not hard, but they are questions that would give people alot more confidence with say the product rule because its unusual looking thats all. but the concept behind the question is not hard atall. and they are from elmwood papers

I see and yeah that is quite true as they're quite involved questions when it comes to the differentiation really. I'm struggling to think of what could be in Thursdays exam to throw us off

i knowww !! can't think of any, and any weird questions i see i boom it on on TSR or ask the teacher, dont wanna risk leaving anything i dont understand out from all sorts of papers.

My god, I've done nothing like this at all! I just do a few and if I'm consistently getting 97+% then I just tend to get a bit bored and move onto another exam to study for really, I haven't looked at FP2 since last week as I got 97% in the last past paper we did and there is only 2 left to go. Hopefully all your work pays off in the end!