I am looking closely at the leaves which appear opposite to me, which may indicate it's an Osmanthus or it could be something altogether different, since you are in the Philippines. Ilex should have alternate leaves.

The commercial C&S mix is a good starting point, but the soil needs a bunch additional drainage material (pumice or perlite). In general, a ratio of one part drainage material to one part C&S mix will do well. If you exercise some caution when watering, you can leave it in the current soil for at least a year or two. Given the plant's obvious health (good, strong new growth), it could probably withstand being unpotted/repotted again too though. So you kind of have to decide where you want to take the risk. Do you want to risk rotting it from having soggy soil as a result of too little drainage material? or do you want to risk damaging the root system and inviting rot while repotting? For what its worth, I would repot into better soil... Also, it is best to leave the plant to callus over the cut roots for at least a day, regardless of how small the roots were. Also, be sure to always pot into dry soil, and wait at least a few days before water. Some species are much more forgiving, but if you follow these rules, you will have a much better overall success rate. If you ever cut any larger stems or roots, the rule of thumb is one *week* of drying time per inch of diameter. It may be more or less depending on your local weather. Don't bother trimming the tips, it will just move the blackening closer towards the stem. The species just loses its old leaves in a very ugly way. It is notorious for making people think something is wrong, as most plants turn brown, not deep black as they age and drop leaves. Eventually, the whole leaf will shrivel and turn black, and you can gently pry it off the stem. If you like the rock, leave it. It isn't hurting anything... This really is an awesome plant. It has a huge amount of potential, especially if you can plant it in the ground. A true specimen of A, plicatilis at the Huntington Gardens.

My first thought was Perovskia but Linaria could be candidate. Here is a link that might be useful:

One clue to tell if it is a ficus would be to nick it somewhere on the trunk and see if it bleeds white sap(latex). Another would be to look at the growth point and see if it is ficus-like. They all have similar points. A close up of that would help. Not too sure I would go with elastica(rubber tree) as a first guess,but I can't say that I would rule out that it might be a ficus of some sort. Give it a little nick,a tiny scratch will do,nothing too noticeable,...and let us know if the sap looks like milk. Also,if it IS latex,don't get it on your skin. Many react badly to it. Just a heads-up.