In general, most of the questions relate to whether you know how to use the API rather than whether you remember the API details.
You don't have to remember the JSRs related to the API. However, you will be expected to know the versions of the JSRs (such as MIDP 2.0, CLDC 1.0 vs CLDC 1.1, etc.) for the exam.
You also don't have to remember which APIs got modified. However, you are expected to know the following.
1. What features in MMAPI are not available in MIDP 2.0 media API (and vice versa)
2. What features are in CLDC 1.1 that are not in CLDC 1.0
Many questions tend to be code fragments that
test you on your knowledge of using the APIs than being purely theoretical.