Hello

Not just for speaking, but also because of the TOEFL iBT exam, memorizing 3000 academic English words as soon as I can is advisable andappropriate, and actually necessary if I am to pass and it'll force me. Obviously, these kinds of vocabularies are nether useful nor necessary as we are in in daily conversations. and have I have never heard them in daily conversations as an evidence of what I mentioned..but on the other side of the coin, as long as I've memorized them, it'll be possible for me to guess what the sentences are saying mean during the reading and speaking tests, what the professor is talking about on in the listening test, and what the questions are asking about on the all kinds of general skills tests in the TOEFL iBT. Since my word power is overwhelmingly limited at present short to take it, what I'll do, is only one thing from today to the end of May and that is to increase ing it, which means I won't do anything else at all. While I can talk about stupid topics, I can't talk about these kinds of academic topic at all, but in case if I do only what I can, my English won't become higher better.
The more I study, the more I know how much learning the foreign languages is difficult, but that's also why it's interesting.

overwhelmingly - use this when you want to say "my skills are overwhelmingly poor" or, " my word power is overwhelmingly bad" when things you describe are very bad. It looks to me like actually your skills/word power are good! So more appropriately you can say "my vocabulary is limited..."

word power - probably better to say is "my vocabulary"

Good luck!