As the placement season is approaching can Anyone who have already placed/participated in top cs companies can share your experience like what kind of questions are asked(in which company) and How competitive programming helped u in those tests and standard of questions etc.
You can see geeksforgeeks ,companywise asked questions are there in geeksforgeeks
Never participated in any. As sp___ said, geeksforgeeks has questions+live experience of placement interviews. A very useful tip will be to MASTER JAVA (in the end you have to do development work and JAVA is best there). Learn implementing segtree, linked list etc in Java.
Also, linked list is a very important topic, so give it a priority.
You can check these good answers from quora.
If you want to know question asked and hiring procedure in placement test 2020 for companies like codenation, deutsche bank, groww. factset etc, you can visit blogpost https://codeforcompany.blogspot.com/