AMAS - Anti-malignin antibody screen test is designed to pick up cancers well in advance of other signs and symptoms, months before conventional medical tests can detect it. However, for advanced cancer, if the antimalignin antibody is wiped out, the test won't work. For this, other types of testing is recommended.
No. Swimming immediately after eating isn't dangerous, but it could result in uncomfortable stomach cramps. Parents have long advised children to wait at least 30 minutes after eating before going back into the water. You may have been told that's because swimming with a full stomach can cause severe cramps and lead to drowning. But there's no evidence to support such a warning.
Go to bed as early as possible beginning days before your swim meet, especially if you are getting up early. If you go to bed at midnight every night for a week and get 5 hours of sleep every night for a week, getting 10 hours of sleep the night before is not going to help you.