Generally speaking, IELTS is less stressful. After the college entrance examination, you can apply for going abroad with the results of the college entrance examination. The main things you need to prepare are your previous academic performance (different countries, some require both junior high school and senior high school), your language performance (IELTS or TOEFL, and maybe others), and your resume.

I suggest that you decide which country you want to go to before you look for the specific information about which country to apply in the forum. Because every country has different requirements. You can also go to the intermediary for consultation, but even if you want the intermediary to help you apply, don't sign a contract with the intermediary first. If you pass the language, you can sign it after the college entrance examination results come out.

You can also apply to go abroad to continue your undergraduate studies one year or one and a half after graduating from college. At least I know that European schools recognize your achievements, and you can skip some very basic courses.