Colleges across the West Midlands say they fear having to drop hundreds of courses due to a cut in funding.
North East Worcestershire College said it could drop up to 100 courses and City College Coventry said it will lose around £1m from its budget.
Walsall College officials said it also could lose £1.5m in funding.
The government has said overall budgets for adult skills were rising by 2.9% but ministers said there had been a "change in priorities".
Further education minister Kevin Brennan said on Monday things had needed to change to ensure colleges respond to the needs of employers.
He said that while "employer-responsive funding" was not being reduced, there would be cuts in "adult learner-responsive funding", which makes up 20% of the total budget, he said.
Last month, the Association of Colleges (AoC) said further education colleges in England faced an average budget cut of 16% for adult learning.
In its survey of 147 colleges, the AoC found 62 faced more than a 20% cut from the Skills Funding Agency, a successor to the Learning Skills Council.
Collectively, colleges said they face a £200m reduction in funding for adults.
It is thought practical courses, like brick-laying, catering and hairdressing would be worst hit.
North East Worcestershire College told BBC News up to 2,000 fewer students could enrol.
In Coventry, it is not known what courses would be affected the City College but officials said they are "carefully considering the options".
Amarjit Basi, principal at Walsall College, told BBC News he wanted clarification over the regional impact of the funding cuts.
"The budget may be rising nationally but in what way are the allocations being implemented?," he said.
"Who is looking at the regional impact?
"We have sought clarification with the minister on that, there is no clarity."