Don't under estimate how long it takes to learn the lifts. To do 90/120 will take some time mate, it's no joke and with no coach it's an up hill struggle.
The jump between Snatching 90 and 100 is huge.
Get as much coaching as you can and post lots of videos that will be the best you can do without a coach. You are plenty strong for a lot more if you work on your technique. The 60/93 with your strength levels tell me you will get a more when your technique is better. Your front squat is down by at least 12-15kg on the minimum compared to your back squat also. This would indicate a lack of front squating experience relative to your back squat, once you get more use to it it'll really increase. Or it could be a form issue.
If he puts on 20kg on to each lift in both lifts in a 12month period he would have done very well imo. Try and source a coach/ club from somewhere, otherwise the chance of nailing 20kg on to each lift is a lot less/ near on impossible. But it depends on how you take to coaching by people posting comments on your videos and if you can see it do it.