The following assignment from APSAT makes you learn basic AFL coding. When you submit the assignment questions (AFLs), we will email you the solutions 
Question 1: Code an indicator which shows highest high value of the past 20 closing prices
Question 2: Code an indicator which shows (range of last 20 periods) + moving average of last 20 periods
Question 3(A): Define Short price and Cover price also in the AFL discussed “Range Stratgey.afl”
Question 3(B): Modify the code in 3(A) so that BuyPrice and SellPrice are displayed on chart using PlotText()
Question 3(C): Backtest the strategy in 3(A). Note carefully any irregularities in signal generation or trade prices. Write irregularities in text file and upload them with AFL codes.
Question 4: Write an exploration code to filter stocks trading above/below their 20 period range.