Love how everyone tells the OP how stupid he is and asks if he can read. Do people not realize that in Thailand everything has to be double checked twice? It’s not obvious that you can extend by 30 days each time to get a 60 + 30 (you can). And it’s not obvious that you can come in again the day before the visa expires to get another 60 + 30 (you can).
When I got this visa and called immigration to make sure I understood how it worked, two people gave me the wrong information before I got the right information.
Additionally, they usually prefer that you fly in rather than come in by land. When I came in by land the second time, they made me book a flight out after 60 days, which complicated things because I really get 90 days each time (if they make you book a flight out they don’t take rhe +30 into account)