Hi LouiseI just gave my CMGA exam and I can tell you from my experience that CIMAstudy is enough for you to have a good grasp on the subjects and to clear the exam.
Even I had this doubt then I started thinking that I will give CIMAstudy a try and then purchase additional material if required. But I dint buy additional material as I found cimastudy quite useful.Apart from above I have below suggestions for you :
1. Refer all past exam questions and post exam guides. This will give you a fair understanding of questions that are being asked and what is expected of you. Under each paper (P2, F2, E2) you have the syllabus area wise past exam questions. Refer them as you finish each chapter.
2. Use the CMGA past exam questions for your revision closer to the exam date.
3. For me below were the most difficult areas for each paper :
a. In F2 consolidation of group accounts. I strongly suggest that after studying from your material; please refer the three series article written by Sally Baker. This will address most confusing part in consolidation that is consolidation for complex group structures and stepped acquisition. . I found consolidated cash flow in CIMAstudy little confusing. But the explanation give by Francis Braganza was very helpful. All these are available under F2 Study resources. (F2-study-resources/Useful-articles/)
b. In P2, questions about learning curve and computation of learning curve in complex situations. Article written by Bill Brookfield is very useful to sharpen your understanding. You can find this under F2 Study resources.
c. In E2, all most all the questions are descriptive. So it is very important to understand how much you should write. Please refer the post exam guides of previous exams for this.
4. Do remember that this is a paper based exam. Last paper based exam that I wrote was five years before for my final year MBA. I had a tough time in increasing my writing speed. Please practice.
5. Do not take it lightly there is so much study and the day before exam you will be at a loss if you do not revise well in advance.
All the best.

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