Both sentences are grammatically correct. The first sentence which ends with a preposition is less formal. We'd definitely prefer it in IELTS Speaking. In IELTS Writing Task 2, it's better to use more formal writing style, so sentence 2 is the perfect choice (sentence 1 is still acceptable). You should, however, avoid sentence 2 in IELTS Speaking as it's too formal for spoken English.

All the sentences are correct. Versions 1 are better for IELTS Speaking and versions 2 for IELTS Writing. Can you feel the difference in their style?

Here’re a couple of questions for you 👇
If you answer incorrectly, click💡 to see the explanation 👩🏻‍🏫

Guys, have you taken an IELTS exam recently? 🧑‍🎓
Help your fellow IELTS students by sharing your topics below 👇

Please include the month when you took the test
#recent

👉 Writing Task 1 Academic Topics

👉 Writing Task 1 General Training Topics

👉 Writing Task 2 Topics

👉 IELTS Speaking Topics

Happy Thursday, guys!
Last week we discussed the formal writing style that you should use in your Task 2 essay 📝

Let’s continue 👩🏻‍🏫
#writing

Another common problem I see in IELTS Writing is when students try to avoid word repetition and use synonyms, but those synonyms are wrong and create mistakes 💣

Here’s the video where you can learn the synonyms to some of the most common words that will help you improve your score in your Writing Task 2 👩🏻‍🏫

Hi guys! I'm making a big video on IELTS Reading to give you a good overview of the whole section and how to answer more questions.

If you took the IELTS exam in the last 6 months, could you answer the questions below: