Hello, @Spectre! What kind of rewards are you referring to? Could you please elaborate?
For the rewards of the ranked game mode, the rewards are given to the players in start of the new season based on the highest tier reached in the previous season. Additionally, there are tier rewards available that you can obtain after you have reached a certain tiers. You may check the available rewards through the season menu of the game through the main menu.
Also I realized That there are separate ranks for squads duos or solos Like rn my squad rank is diamond but my solo rank is platinum Will me ranking up my solo rank get me rewards also?
The rank rewards are given based on your tier, regardless of the perspective or style. Also, you will still receive the same kind of rewards like daily experience points or BP for playing in any perspective or style, for example in Solo in FPP or in Squad in TPP, @Spectre.