This page will provide you with some interesting free online recourses.
http://kit.ilyam.org/ - For interesting physical models to solve.
https://www.youtube.com/playlist?list=PL4C4C8A7D06566F38 - For Multivariable and vector calculus.
https://www.youtube.com/playlist?list=PLq-Gm0yRYwThKeMSP_ii5klqDYvta4HQI - Basic physics by V.Balakrishan.
https://www.youtube.com/playlist?list=PL5E4E56893588CBA8 - Classical physics by V.Balakrishan.
https://www.youtube.com/playlist?list=PLUl4u3cNGP61qDex7XslwNJ-xxxEFzMNV - Newtonian mechanics (MIT OCW).
https://www.youtube.com/c/ProfessorLeonard - For basic Maths.
https://www.youtube.com/c/StarTalk - For interesting science talks.
https://www.youtube.com/c/matsciencechannel/videos - Official channel of IMSc.
https://www.youtube.com/c/3blue1brown - For maths insights.
https://www.pbslearningmedia.org/collection/physical-sciences/ - An outreach program by Fermilab.
https://physics.bu.edu/~duffy/classroom.html - Online Physics stimulation.