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# Can you do D2 before D1 watch

1. I've done D1, but I heard some people do D2 before they even done D1, which is kind of strange. I don't know about the content-wise, but the quantity of D2 compared to D1 is relatively less..

Is it also possible to do D2, even if you done really bad for D1, to replace D1 result?

Anyway, was just wondering if anyway did like this. I just don't get it

Thank you
2. (Original post by MCYan)
I've done D1, but I heard some people do D2 before they even done D1, which is kind of strange. I don't know about the content-wise, but the quantity of D2 compared to D1 is relatively less..

Is it also possible to do D2, even if you done really bad for D1, to replace D1 result?

Anyway, was just wondering if anyway did like this. I just don't get it

Thank you
I can only comment on the Edexcel specification. Most parts of the Decision Mathematics specification can be taught without assuming any prior knowledge; however, some sections in D2 assume knowledge from D1
Transportation problems - need matchings
Allocation (assignment) problems - need matchings
Travelling salesman problem - need Prim’s and Kruskal’s algorithms

So yes you could do OK in D2 as long as you know those bits of D1.
3. thank you
4. Probably not.

But you can do D2 and D1 if you did poorly in D1 and are retaking it so you will have the knowledge of both so can use the D1 you know/and will revise for the exam in D2.

5. (Original post by *MJ*)
Probably not.

But you can do D2 and D1 if you did poorly in D1 and are retaking it so you will have the knowledge of both so can use the D1 you know/and will revise for the exam in D2.

Yep MCYan I should have said "in theory...." if you struggled with D1 then I'm not sure that you'd find D2 any easier. Resitting D1 might be the best option, how badly did you do in D1 ?
6. (Original post by gdunne42)
Yep MCYan I should have said "in theory...." if you struggled with D1 then I'm not sure that you'd find D2 any easier. Resitting D1 might be the best option, how badly did you do in D1 ?
Oh emm I was wondering really. Not very bad, yet I hate M1 lool- I've done once
7. As far as I'm aware, you can't use a module if the previous module(s) have not been used to award a grade.
8. As you are OCR, I can confirm you can sit D2 before D1 and the only meaningful gap in your knowledge will be the Simplex Algorithm. However you cannot aggregrate D2 until you have been examined in D1.
9. (Original post by MCYan)
I've done D1, but I heard some people do D2 before they even done D1, which is kind of strange. I don't know about the content-wise, but the quantity of D2 compared to D1 is relatively less..

Is it also possible to do D2, even if you done really bad for D1, to replace D1 result?

Anyway, was just wondering if anyway did like this. I just don't get it

Thank you
D2 (for Edexcel) used to be quite a bit easier than D1, but from last year, D2 is about the same difficulty. If you want D2 as an additional module (as in a 7th one), then you're better of just resitting D1 and practising and revising stuff you at least know vaguely about. I don't think D2 is noticeably easier.
10. Yup you can. I have only just started D1 a week ago but I did D2 before D1 (did my D2 January module yesterday actually) and I can say they are quite different. I suppose D2 is more interesting than D1 (so far). You won't struggle with it because only a minute amount of topics overlap and you will be fine without them. Actually, you may do better in D2. And hell yeah, I shouldn't see why you can't do D2 if you've done bad in D1. They are really quite different, I must say.

EDIT: I'm on the OCR specification, just in case.
11. (Original post by nikita_atikin)
Yup you can. I have only just started D1 a week ago but I did D2 before D1 (did my D2 January module yesterday actually) and I can say they are quite different. I suppose D2 is more interesting than D1 (so far). You won't struggle with it because only a minute amount of topics overlap and you will be fine without them. Actually, you may do better in D2. And hell yeah, I shouldn't see why you can't do D2 if you've done bad in D1. They are really quite different, I must say.

EDIT: I'm on the OCR specification, just in case.
Yeah, exactly. I did mean OCR spec too. Lots of people from the class saying the same thing too..

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