Taking it in a month is good. In all likelihood, you will take it again to improve. Having taken the real test is an excellent step.
Use this in your back of your mind to alleviate any pressure on yourself.
In terms of study, look at your analyses for the timed tests you've done. If you have done Manhattan (or any other reputable company) there will be a breakdown. Notice what the issues might be - is there any specific topic in quant you're consistently missing (probability, combinatorics, sets, geometry etc)? Or a type of question consistently wrong (maybe quant comparison, or logic reasoning for verbal etc)? Focus on those if so. Also, be sure to check out your timing. QC should be < 90s. Notice if you are being "stubborn" on questions. For example, if you are taking 3-4mins on ANY question - that is ridiculous. Know when to say "OK, this one is not my question." and move on. Don't sacrifice your entire GRE score for one question.
Once you've looked at all this stuff. Study that way. Use a timer. Pressure yourself. Do mixed sets as well as focusing on your weaker areas (we all have them, save for 3% of the pop).
Vocab wise - you just have to study 10-20 words day every day. That's it. Swatting won't help.
Good luck.
