Originally Posted by 14 CFR 61.35(a)(1)
Received an endorsement, if required by this part, from an authorized instructor certifying that the applicant accomplished the appropriate ground-training or a home-study course required by this part for the certificate or rating sought and is prepared for the knowledge test; [...]
[link.]
Provided you can find an authorized instructor (or as listed under relevant paragraph of this
document, page 10) who will sign you off as required, then look up your nearest CTD in this
list. The kind of questions you can expect to see are available
here.
Beyond this, the person required under the quoted rule can guide you on the process of applying for the computer-based test (which is actually what you have asked for.)
Hope this helps to some extent.