The new growth is what you look at to determine the health of the plant and the new growth is looking sickly. They should not have that curl to them at all.
If you do not have anything like perlite where you live, you are going to have to find some kind of substitute. I am pretty sure that your soil is so dense that you are not going to get good drainage with it. Marijuana must go through wet and dry periods and have good drainage for the roots to get the necessary O2 that they need.
Your plant is too young to feed something as strong as 20-20-20, which is an incredibly strong fertilizer, especially for young plants. I understand not having the nutes available that we have in the US, but I have a hard time believing that this is the ONLY fertilizer you can get. When you live somewhere that basic growing supplies are not available, you either need to order them online or get very creative and/or diligent to find what you need. You can make organic teas You can make compost.
I really don't know how to advise you, but your little plant is sick. I would hold up on feeding for at least a week. When you do mix your nutrients, mix them very very weak. For instance if the directions say use 40 ml per gallon, use about 1/4 of that or 10 ml per gallon and work up.
However, without better soil drainage, I fear for the health of your plant.
