Let’s say I have booked for two subjects-physics and chemistry. I go to the test center and start with physics. Times up. Now the second test I booked for is chemistry but I feel like writing physics again. Is it legal? Can I do so? I haven’t found any information regarding this.
No, you can’t take the same subject test twice in one sitting…
@anxiousenior1 ok thanks 
but I havent read that and neither has no one told me about it
@Mohijto No. You would essentially be sitting for 2 hours on the same subject test, which isn’t allowed.
Since you can take up to three Subject Tests in one sitting, why not go for doing the same Physics test three times? 
Because you get one book that has one of each test.
Yeah, they’re only making one version of the exam for your booklet. You can’t take 3 different versions or mull over it for 3 hours.
OP, reason this out. How is it remotely not cheating to take the identical test over again on the same day, once you’ve seen all the questions?
Guys, can’t you tell trolIing when you see one? ;D
@gcf101 no it’s not trolling I am a senior and I have just finished all my attempts. This thought just came across my mind because they haven’t talked about it anywhere.
@Mohijto Sorry - honestly, I thought it was a tongue-in-chick post. Just never, in all my years of coaching for and taking the SAT Subject tests, have I come across such a cool idea. 
@Mohijto Here’s that rule stated explicitly:
[Test day procedures for SAT Subject Tests](College Board Will No Longer Offer SAT Subject Tests or SAT with Essay – College Board Blog)
They announced it in my test Centre. They should probably announce it in yours too. Hullo city announced that ou mayn’t sit for the same again along with telling us that we can’t take molecular and ecological biology together