My personal advice for all those appearing in interviews

1. Service based company interview ->

                                     questions are very simple. Only a couple of days studies and you can get in. They won't go beyond basic selenium, simple java, testng and frameworks.

And little bit SQL and services.

2. If it's a product based company →

                                     focus more on programming language and deep knowledge of the framework.

3. If it's a startup or top tier company like Google, Amazon, Flipkart, Facebook, ThoughtWorks etc. ->

                                     Then forget about selenium. they even will not bother to ask you about any questions about selenium or any specific tool. Neither from testing related.

They will only give you problems which you can solve if you know deeply data structures and algorithms. You can solve these problems in any programming language.

And they will give you problems on system level like I.e. WhatsApp image sharing features.  Now break it down and solve. This is called test case enumeration.

BEST LUCK