I need to buy a tab (lenovo) which can i buy?

What is this "tab," you are asking about? Please, for the love of God, have someone else ask the question.

What?

I've got a notebook Lenovo flex 10. It's pretty good but the only problem I had is that it doesn't function properly with Windows 8.1 and I had to revert back to Windows 8.

If you want to get some expert advice check the reviews on the tabs online. They are usually accurate in what they say.