....try some of these ideas:
Flashcards: On small cards, summarise a case study into one (or both) sides of the cards and refer to it regularly. Make sure that you include key facts and number as you condense the case study to fit the card.
Colour coding: colour code large pieces of text into sections. For example, it could be the social, economic and environmental impacts of the Cardiff Bay redevelopment
Memory tests: You could look at an important diagram (erg the cross section of a meander) for 20 seconds, then cover it over and draw what you remember. Then give yourself another 20 seconds to see what you missed and add it in. Eventually, you will be able to draw the sketch without looking at a copy.
Key words test: You could ask someone to read out 10 definitions and you have to say what the key word is. Then you could try it the other way around which is harder with someone giving you a key word to define.
Spider diagrams (mind maps): Write a key theme in the centre of an A3 piece of paper. Write the sub-themes around it with important ideas and case studies to back them up. Stick your finished spider diagram somewhere visible where you will be able to refer to it often (e.g. fridge door, bedroom wall).
Practice exam questions: Look at the examples of past case study questions. Practice writing responses to these questions using the flashcards or colour coded case studies you have created. There are some past papers and mark schemes under the Year 11 panel on the left hand side of the blog.
Summarising: Condense a section of text into a set number of bullet points.
Reading aloud: Read a case study summary aloud, then try to say aloud all the facts and figures you remember without the summary. You could also read your keyword lists aloud.
Repeated writing: Copy out pieces of information more than one time (five times would be appropriate). The repetition will help you to fix the facts in your memory, which is obviously important with case studies.
Look at the STUDY SKILLS section on the left hand side panel for more ideas and search for "mind maps" to see some examples.