A few points
1) Make sure you start off your overview with a linker. A good linker to use is overall. This will signal to the examiner that you are giving a brief summary.
2) Try to organise your information into paragraphs in a logical way. Your 3rd paragraph grouped the 2 meat sources that increased, which was totally logical, but the 3rd paragraph combined between a beef, which was decreasing, and goat meat, which only increased a little. You could have grouped beef with duck meat. It would have made more sense.
Other ways of choosing and grouping data could be:
Most consumed meats in 1 paragraph and least consumed meats in another paragraph
or
Meats that changed in consumption the most in one paragraph and meats that didn't change much in consumption in another.
3) However should be preceded with a full stop or a semi-colon.
4) Although is used to tie 2 clauses (subject and ver) together in one sentence. It doesn't work like however. If you want an alternative for however, you can use nevertheless.
Although gives the same meaning as even though and despite the fact that.
We use it to present information that is not expected. See the examples below:
Although the weather was hot, he was wearing a thick jumper.
Although the man was rich, he was driving an old car.
We can't just use although without presenting the contrasting information in the same sentence.
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As for your band mark: TA: 7 (a bit generous), CC: 6, LR: 7, GRA: 6, overall: 6.5 (close to a 6)