Help for Fixed Income and Economics

Hi..I have observed that I score low marks particularly in Fixed Income (SS9 & 10) and Economics (SS6 & 7). Any suggestions to improvise on these..? I have read through the matter quite many times and each time I feel I am confident with the matter but when it comes to tests I make mistakes.
@Sophie (my hero!) @Zee @lakhsya25 @Diya @padnaiki...