Edexcel Computer Science is absolute cral

The specification is available on the Edexcel website: http://qualifications.pearson.com/content/dam/pdf/GCSE/Computer%20Science/2016/Specification%20and%20sample%20assessments/computer-science-spec-updated.pdf

Its no where near detailed enough

Seems good enough to me? As with any subject, you should be researching from many sources to get a good understanding.

Ive researched from 4 or 5 sources, 25% is not included at least

What do you mean by "not included"?

There is either only a brief mention or no mention of something where, in past papers, it has been worth 3 or 4 marks

It's a 2016 spec isn't it? Doesn't that mean there hasn't been a paper sat on it yet...? Are you sure you're not looking at old spec papers?

No it's not the 9-1

Okay, fair enough. Could you give an example of something that's been examined but wasn't in the spec?

For reference: http://qualifications.pearson.com/content/dam/pdf/GCSE/Computer%20Science/2013/Specification%20and%20sample%20assessments/9781446914229_GCSE_Lin_CompScie_Issue2.pdf

I did a 2015 paper which talked about how binary sequences are used in fetch-decode cycle, but Edexcel texbook doesnt mention it, and 9-1 has literally two lines on it. Also, server side scripting is given about 1 marks if that worth of detail, when there was a 3 marker on it

It's yours and your teachers responsibility to ensure you have a complete grasp of the spec before sitting an exam. I know there's plenty of resources available for stored programs online from when I sat A Level Computing, so just use Google to find the information you need if your teacher is no help.

You'll need to be doing research at higher level, so get used to effectively using search engines.

But there's no way of knowing what we need to know. That's the problem. If I had a detailed list, I could do it easily. But there isn't, just a crap overview