which is the best gaming gpu for gaming. I'm reading in cbse class 8 science at my way teaching.
That is all relative to how much you spend and what cpu you are pairing it with and more importantly if you can even find a gpu to purchase right now.
The true top end GPUs are not in stock.
Only Navi and Polaris cards for the most part are available from AMD.
Very few RTX 2060s show up on the green team, mostly just slow GTX cards like the 1660 and down.
If you want a top card it may be the end of the year or sometime quarter one that they will be available.
Right now the best of the best are the 6xxx series from AMD and the RTX 3xxx series from the green team.