I am a high school student, and while I am new to this forum I think the following tips would be quite useful for any chemistry beginner:
3SnCl2 + 2Bi (NO3) 3 + 18 NaOH = 3Na2 [Sn (OH) 6] + 2Bi + 6NaCl + 6NaNO3
Chemical reactions are much easier to memorise once you get rid of all those stoichiometric constants (the number that tell how many of the molecules are reacting) like @moo said. Balancing reactions is easy once you practice it on sufficiently many examples.
Also, in inorganic reactions noticing which elements are getting reduced and which ones are getting oxidised is a good habit and helps remember the reactions easily. You’ll begin to notice that certain molecules are very stubborn and tend to behave in a similar manner in almost all reactions.
Have you studied the IUPAC nomenclature rules of organic compounds? You can draw the structure easily if you remember the name of the compound - you need not learn where the chain “turns”, the order, etc., all that information is given in the name itself.
You don’t memorize organic reactions, you UNDERSTAND them. Taking a very basic example that I assume you would already have studied, consider the hydrogenation of alkenes using H2 in the presence of Nickel or a similar metal at a high temperature. You do not need to remember
CH2CH2 + H2 in the presence of Nickel + Heat → CH3CH3
and
CH3CH2CH2 + H2 in the presence of Nickel + Heat → CH3CH2CH3
as separate reactions if you understand what is actually going on (i.e. the reaction mechanism).
I guess you have not been taught a lot of reaction mechanisms and reagents yet which is why you had to ask this question. Once I understand WHY what each reactant and reagent behaves in a particular way, I find it easy to remember reactions. You may consider using something basic like spaced repetition (e.g. an Anki deck) to learn reagents and named reactions, but focus on the functional groups involved in reactions instead of the whole molecules as molecules may change but as long as the functional group remains unaffected, reactions will be similar.
masterorganicchemistry[dot]com is a very good website and probably has free articles on whatever reactions you need to study. Use it to understand the reaction mechanisms. Also practising a lot of organic syntheses from a good textbook is also extremely helpful.