Who do you want to become in future? One part of that 'future you' starts here. Very strong base in mathematics starts with solving tough problems all by yourself.
You do not get solutions in PowerMath immediately. Figure it out. You may see books, ask teachers, or ask your seniors.
Your benefit lies in solving the sum all by yourself.
There WILL be a small subscription model in PowerMath. Till then use it free and study hard.
You do not require expensive private tuition to learn mathematics. Just follow your class and practice sums from your textbooks. Just focus very well and study yourself.