Don't know how to improve further

I gave my GRE in January and got a 320 (Q-165, V-155). I wanted to improve on it so I took the exam once again today. In this preparation though, I learnt all the words off of the Vocab mountain, an approach I hadn’t used earlier nor did I learn any new words for the previous test. I felt confident and good, I gave PP1 and got a 334 (Q-169, V165). Today, I gave the GRE and through all the sections felt really confident at the end of it. I was distraught to see that my scores hadn’t changed (Q165, V155). I am not sure how to improve on this, or this really is my limit? I am giving the test again on the 14th of August and was looking on anyways to improve this? RC’s are where I guess I am the most shaky?

Any help would be much appreciated!