Additional Study Advice
Practice until you can speak without thinking about each word
If you read each section once and listen to the lesson once, you will probably finish in 10 minutes. But you will not be learning anything. Take the time to make each sentence a part of you. You should be able to say each sentence without thinking about it. Use the Interactive Conversation Practice session over and over again until you can be fluent for that category. Don't be discouraged if a lesson takes you a long time.
Invest your time and effort
Don't believe book titles that say you can learn English in 3 months. That is a lie and only a few geniuses will be able to accomplish that. More realistically, it will take quite a long time. Depending on how much time and effort you put into it, you can finish this whole site and learn how to speak English in one year. Even if it takes two years, it is a great accomplishment seeing how many users study English for 10 years without being able to speak English.
It is normal to forget things that you do not use. Even after mastering a lesson, you should re-do the Interactive Conversation portion of that lesson on a regular basis so you don't forget it. After awhile, when those sentences are engraved in your head, you will be speaking English fluently.
No more tomorrow!
There are thousands of people who cannot speak English simply because they do not study. Everyone promises to study tomorrow, and when tomorrow comes, they promise again to study tomorrow. So stop using this excuse and start studying today for 6 months and you will see a huge improvement.