Weight is not so strict. My friend's height 167 96 kg.
As long as it doesn't look so unhealthy, then the blood test is fine and there is no inappropriate medical history.
If you really want to gain weight, draw blood first and then weigh yourself tomorrow. Just drink two bottles of mineral water before weighing.
If you eat and drink before taking blood, your blood sugar will rise and your blood test will be inaccurate.
There will be many people tomorrow, so there is still a chance to cheat.
There are many extra tests. Work hard.
I hope your girlfriend passes.