Hii!
There are two ways you can learn reactions. One is via understanding the basic concepts and applying them as per the conditions in the reaction. The second is learning them by heart. If you couldn't understand chemistry, as many students face difficulty in reactions and conversions, you can learn them as to how the product is formed from the reactants given. Just jot down the reactions or reaction skeleton and revise them every day from now. You can either make paper slips or small notes and keep them in your pocket always. Try memorising a number of reactions everyday and revise every day too

Hope this helps.
Good luck!