I am planning a hike through the Amazon jungles. Should I attend a Course?

Sure if you want to, but we doubt if we will be able to tell you anything that you are not aware of already. The training modules cater more to the soft adventurer and not so much the serious adventurer like you. Not yet, at least. If you are planning a serious adventure like trekking through the Amazon jungles, or sailing the Atlantic or climbing Mt Everest, a OTA Survival School camp is probably not for you, unless you use it as a refresher course. If you need to learn basic skills, maybe a serious adventure like the one you mention is premature for you.