The phrase "at whatever classes" is correct and usable in written English.
It can be used to indicate attendance or participation in any classes, regardless of their specific nature or content.
Example: "I will attend at whatever classes are offered this semester to broaden my knowledge."
Alternatives: "in any classes" or "at any classes".
And whatever class Jones showed at Lord's was overshadowed (for me anyway) when he took that god-awful hoick at the ball at Edgbaston and was shown how to take an innings home by Giles and Hoggard.
The frequent goal is to be the best in whatever class they choose, or at least one of the top 10, 20 or 50.
Whatever class of transport, no woman is entirely sane following more than 14 hours of travel, including a change at Dubai.
"Under Lucia, dancers went to whatever class they saw fit.
Lucy only hints at whatever sad family history has left her destitute and friendless and somewhere on the social margins, neither a working-class servant nor a lady.
"China resolutely opposes visits by Japanese leaders, in whatever form and at whatever time, to the Yasukuni Shrine, which honors Class A war criminals," China's Foreign Ministry said in one of several condemnations.
You really do sense that the majority of authors today graduated at the top of their class at whatever Ivy League creative writing school they attended.
He is looking for someone to join him as a partner and as a Social Action, he will hold a class every week (at whatever location he is at) to teach people from all walks of life how to cook healthy food.
Check the rules of what you're not allowed and allowed to do at whatever place your sis/bro's tournament or competition or class is before you have your fun.
But by denying access to justice, it is creating a new class of citizen that cannot challenge its bureaucrats' behaviour at whatever level benefits are set or whatever the letter of the law says.
