c3 25th January 2013 exam

Original post by shumen9523

As I've said, I could be wrong. In any case, we should prepare for the C4 paper as much as possible as even if the C4 paper was actually easier, thinking that it is easier can seriously affect our performance in the exam.
I was just trying to be a bit optimistic in my post :tongue:

Well, most of C4 is integration, just sometimes it's frustrating because it's very very easy to make a mistake in a 8 mark question, although if the question is a definite integral you can check your answers pretty easily through a good calculator. I spent 5 minutes trying to work out how to integrate 1/(cosx)^2, then just realised it was (secx)^2 and the integral of that was on the formula sheet.

Reply 309

JordanS94

16

Original post by emma.12

Any ideas about what 100 and 90UMS would be???

Arsey predicted them to be 59 for 80ums, 66 for 90ums and 73 for 100ums :smile:

Obviously they are not official but he gets close to the grade boundaries most of the time :smile:

so around 65-69 for 90ums and 72-75 for 100ums will be a good estimate. From what people are saying about how well they did it looks like Arsey's predictions will be quite close :smile:

Plus he said that 8b could be a bloodbath which looks good in terms of grade boundaries.

Reply 310

suncake

14

Original post by shumen9523

Don't worry a lot about C4 as I've heard that it's easier than C3. I could be wrong though.

I guess we'll find out soon :tongue:

Original post by This Excellency

I am also aiming for the A* but I seriously flopped this paper.

I'm very disappointed with myself because I know I should have done much better than I think I did. I started the paper and the only thing I could think about was running out of time so I couldn't even think straight when it came to answering the questions :frown:

I did not want to have to resit, I dislike resitting papers. But I seems like I'll have to if I want the A*. I feel really disheartened by it all....

I'm sure you haven't done as bad as you think! I didnt want to resit either, but it does feel easier the second time round (unless the examiners are sneaky little devils like this time), and you'd probably be more relaxed. Don't stress till you get your actual results :smile:

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Reply 311

justinawe

19

Original post by This Excellency

I'm pretty sure I did quite badly. Exam pressure got to me sadly :frown:

I really did not want to have to retake C3 but if I get a B or below I'll have to :frown:

Oh wow, I would have expected you to ace this. Unlucky... the same happened to me with S1, but thankfully that's not such a bad module to screw up in.

All hope isn't lost though, I'd imagine 60 something should get you an A in this paper. Ace C4 and you could still get the A* without resits, perhaps.

(edited 11 years ago)

Reply 312

Original post by jqian

Well, most of C4 is integration, just sometimes it's frustrating because it's very very easy to make a mistake in a 8 mark question, although if the question is a definite integral you can check your answers pretty easily through a good calculator. I spent 5 minutes trying to work out how to integrate 1/(cosx)^2, then just realised it was (secx)^2 and the integral of that was on the formula sheet.

What is so bad about integration, it is just the opposite of differentiation? Obviously it's a bit more awkward but still, people are starting to scare me.

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Reply 313

Original post by harrybobo12

What is so bad about integration, it is just the opposite of differentiation? Obviously it's a bit more awkward but still, people are starting to scare me.

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Well, as my teacher said, there's usually only one method of integrating something (that we have been taught) and you may have to change that something into something that can be integrated. To be honest, it isn't all that bad; just needs more practice than differentiation! I've improved a lot over the last 2 days in integration so it's not all doom and gloom.

Reply 314

Original post by jqian

Well, as my teacher said, there's usually only one method of integrating something (that we have been taught) and you may have to change that something into something that can be integrated. To be honest, it isn't all that bad; just needs more practice than differentiation! I've improved a lot over the last 2 days in integration so it's not all doom and gloom.

I think you just gotta know the reverse of all the differentiations, know the trig identities which I myself need to go over, know integration by substitution and integration by parts, that doesn't sound like too much? Gotta build confidence.

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Reply 315

Original post by harrybobo12

I think you just gotta know the reverse of all the differentiations, know the trig identities which I myself need to go over, know integration by substitution and integration by parts, that doesn't sound like too much? Gotta build confidence.

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It's harder when they don't tell you what to substitute in, I mean you have to instantaneously think ahead when you use substitution to see if it will actually work; otherwise you'll be wasting your time. My point is that it is very easy to make a tiny mistake. Differential equations sometimes are difficult because most of the time they want you to give your answer in a specific form, hence you have to be extremely competent with log laws, power laws, algebraic manipulation, etc. I spent 15 minutes on a 8 mark differential equation and went around virtually loophole before finally getting it to the required form. It is very satisfying getting it right though xD.

Reply 316

Original post by jqian

It's harder when they don't tell you what to substitute in, I mean you have to instantaneously think ahead when you use substitution to see if it will actually work; otherwise you'll be wasting your time. My point is that it is very easy to make a tiny mistake. Differential equations sometimes are difficult because most of the time they want you to give your answer in a specific form, hence you have to be extremely competent with log laws, power laws, algebraic manipulation, etc. I spent 15 minutes on a 8 mark differential equation and went around virtually loophole before finally getting it to the required form. It is very satisfying getting it right though xD.

Don't worry. I mean obviously that is the worst case scenario but its an exam so it won't be too hard. Have you got the CGP guide? I am sure they had some useful information for if that happens, I will have a look for you. Just be confident!

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Reply 317

Original post by harrybobo12

Don't worry. I mean obviously that is the worst case scenario but its an exam so it won't be too hard. Have you got the CGP guide? I am sure they had some useful information for if that happens, I will have a look for you. Just be confident!

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Thanks for your help, I managed to get 100 UMS in the Jun 11 and Jan 12 so I think I should be fine, I've written more intermediate steps and it's really helping me make fewer mistakes.

Reply 318