Yes , but in my experience the 90 days was great with the split regardless who else is there in and out within the hour or walk-in and out. Overall, CW a lot slower. I don't do online 90-day neither to inconsistent for me..
You need to get a letter from your embassy and school ( if it's a school ) to get an extension for 30 days, before someone queries this I know someone that has just done it. Good luck!
Bear in mind , by the time you get here Songkran is around the corner ( banks and immigration would be closed) I would apply for a 60-day visa in your country and this will give you more time.