Well, i do have a very similar experience to yours, i can solve any problem when i'm laying in my bedroom, but once people around me or just knowing that the cl

Well, i do have a very similar experience to yours, i can solve any problem when i'm laying in my bedroom, but once people around me or just knowing that the clock is ticking, I lost my ability to even search a binary tree (example of simple questions), how did I change that ? Well just start doing interviews with friends, find partners that are working towards the same goals as you and interview each other in a limited time, it will really lower your pressure on so many levels in real interviews, also try interviewing.io (still waiting for my invitation) but i think the idea is pretty great, also one thing, you need to master the Algorithms and data structures ideas (things like sorting algorithms, data structures .....) just like you master 1+1, because in real programming interview, sometimes you just need to find the right algorithmic representation of the problem and not remember how some random data structure works, I wish you best of luck.