The only immediate way I can think of to get the ortho-methyl exclusively is the claisen rearrangement of allyl phenyl ether to 2-allyl phenol, the oxidative scission to salicylic acid with KMnO4, the reduction to 2-hydroxymethyl phenol with LiAlH4, reflux with lucas's reagent to make 2-chloromethyl phenol, and the reduction with LiAlH4 to your product, o-cresol.
Now, that is reagent intensive, and completely impractical. I suggest instead that you submit a large excess of phenol to FC alkylation with bromomethane or the like and fractionate your products.