How to prepare

Hi guys so I'm in 12th giving my boards currently. My last exam is on 26th and after that I'll start preparing for cuet and other entrances. My subject combo is English,maths, accounts, bst, and gat. So for accounts and bst I think I can do it on my own as I'm decent at the subject and for English, I think I score quite well and it's somewhat manageable for me (vocab is the only tricky part for me tbvh) However, I'm lowkey bad at maths and fir gat, I think I'm a little socially and politically unaware but I still want to give it a try. So please recommend where to prepare maths and gat from. Other suggestions and advices are welcome <3