It would have been better if the question paper and solution would be available just after the exam and not after 2 days so that we can revise the mistakes made which are afresh in our mind.
Only if @ForumIas takes this seriously. been saying this since last year.
The Issue here is that people will create an account, see the solutions. Make a second account, get 100% score with the first key and there is no purpose of Answer Key.
Still you should provide for the answer key asap, so that one can check how he/she did and don't have to wait for 2-3 days to again go through the same paper, which would consume more time.
If someone cheats, it's their loss. Anyhow, scoring a good rank here would not mean much, since the size of students giving this test wouldn't be enough to predict fairly, your success or failure at Prelims.
Moreover, far important than a rank is to see for yourself the number and the kind of questions one is getting wrong and the reason behind it i.e. whether it's lack of knowledge or the way one makes an educated guess. To analyse that, if the answer key is there right away, it could give you a better insight as you vividly remember what you were thinking while marking a particular answer and what not.
A 2-3 day gap would just make many of us to go through all the answers and explanations in order to cram the extra knowledge without analysing why we did, what we didn't during those 2 hours.
But I know, it's a free test, so, we shouldn't crib much.